diff --git a/lib/libc/gen/err.3 b/lib/libc/gen/err.3
index f6948fed0d86..f0303c0a785e 100644
--- a/lib/libc/gen/err.3
+++ b/lib/libc/gen/err.3
@@ -116,7 +116,7 @@ functions append an error message obtained from
 .Xr strerror 3
 based on a code or the global variable
 .Va errno ,
-preceeded by another colon and space unless the
+preceded by another colon and space unless the
 .Fa fmt
 argument is
 .Dv NULL .
diff --git a/libexec/bootpd/readfile.c b/libexec/bootpd/readfile.c
index 58c65b57edeb..a46f9e5dbe79 100644
--- a/libexec/bootpd/readfile.c
+++ b/libexec/bootpd/readfile.c
@@ -489,9 +489,9 @@ readtab(force)
  * Read an entire host entry from the file pointed to by "fp" and insert it
  * into the memory pointed to by "buffer".  Leading whitespace and comments
  * starting with "#" are ignored (removed).  Backslashes (\) always quote
- * the next character except that newlines preceeded by a backslash cause
+ * the next character except that newlines preceded by a backslash cause
  * line-continuation onto the next line.  The entry is terminated by a
- * newline character which is not preceeded by a backslash.  Sequences
+ * newline character which is not preceded by a backslash.  Sequences
  * surrounded by double quotes are taken literally (including newlines, but
  * not backslashes).
  *
diff --git a/libexec/telnetd/state.c b/libexec/telnetd/state.c
index 79af9333cbec..85eb28881371 100644
--- a/libexec/telnetd/state.c
+++ b/libexec/telnetd/state.c
@@ -1167,7 +1167,7 @@ suboption()
 	if (SB_EOF())
 	    break;		/* another garbage check */
 
-	if (request == LM_SLC) {  /* SLC is not preceeded by WILL or WONT */
+	if (request == LM_SLC) {  /* SLC is not preceded by WILL or WONT */
 		/*
 		 * Process suboption buffer of slc's
 		 */
diff --git a/sbin/fsck_ffs/SMM.doc/3.t b/sbin/fsck_ffs/SMM.doc/3.t
index 245aa1564ed4..66c3281ff153 100644
--- a/sbin/fsck_ffs/SMM.doc/3.t
+++ b/sbin/fsck_ffs/SMM.doc/3.t
@@ -352,7 +352,7 @@ When found,
 .I fsck_ffs
 will prompt the user to adjust the length of the offending directory
 which is done by shortening the size of the directory to the end of the
-last allocated block preceeding the hole.
+last allocated block preceding the hole.
 Unfortunately, this means that another Phase 1 run has to be done. 
 .I Fsck_ffs
 will remind the user to rerun fsck_ffs after repairing a
diff --git a/share/man/man4/netgraph.4 b/share/man/man4/netgraph.4
index 317dfa07cadf..5f773a44335e 100644
--- a/share/man/man4/netgraph.4
+++ b/share/man/man4/netgraph.4
@@ -913,7 +913,7 @@ IP addresses have the obvious form.
 .It o
 Arrays are enclosed in square brackets, with the elements listed
 consecutively starting at index zero.  An element may have an optional
-index and equals sign preceeding it.  Whenever an element
+index and equals sign preceding it.  Whenever an element
 does not have an explicit index, the index is implicitly the previous
 element's index plus one.
 .It o
diff --git a/share/man/man4/rl.4 b/share/man/man4/rl.4
index 7bf06427c059..6666c16e29f6 100644
--- a/share/man/man4/rl.4
+++ b/share/man/man4/rl.4
@@ -207,7 +207,7 @@ the next frame in the buffer before the chip has had a chance to finish
 DMAing all of it.
 .Pp
 The driver can check for an incomplete frame by inspecting the frame
-length in the header preceeding the actual packet data: an incomplete
+length in the header preceding the actual packet data: an incomplete
 frame will have the magic length of 0xFFF0.
 When the driver encounters
 this value, it knows that it has finished processing all currently
diff --git a/share/termcap/termcap.src b/share/termcap/termcap.src
index a8288e12f307..1b18b51c7936 100644
--- a/share/termcap/termcap.src
+++ b/share/termcap/termcap.src
@@ -1113,7 +1113,7 @@ iris-ansi|iris-ansi-net|IRIS emulating ANSI terminal:\
 #
 # D menu: 0110 1001   1   0
 #	LF is newline/LF is down one line, same column*
-#	wrap to preceeding line if move left from col 1*/don't wrap
+#	wrap to preceding line if move left from col 1*/don't wrap
 #	wrap to next line if move right from col 80*/don't wrap
 #	backspace is/is not destructive*
 #
diff --git a/sys/boot/alpha/libalpha/bootinfo.c b/sys/boot/alpha/libalpha/bootinfo.c
index e3571561cc4e..60fd45ddf92d 100644
--- a/sys/boot/alpha/libalpha/bootinfo.c
+++ b/sys/boot/alpha/libalpha/bootinfo.c
@@ -72,7 +72,7 @@ bi_copyenv(vm_offset_t addr)
  * used as a directory for loaded modules.
  *
  * Module data is presented in a self-describing format.  Each datum
- * is preceeded by a 32-bit identifier and a 32-bit size field.
+ * is preceded by a 32-bit identifier and a 32-bit size field.
  *
  * Currently, the following data are saved:
  *
diff --git a/sys/boot/arc/lib/bootinfo.c b/sys/boot/arc/lib/bootinfo.c
index f95e7e47ef40..a0b858c80ecd 100644
--- a/sys/boot/arc/lib/bootinfo.c
+++ b/sys/boot/arc/lib/bootinfo.c
@@ -70,7 +70,7 @@ bi_copyenv(vm_offset_t addr)
  * used as a directory for loaded modules.
  *
  * Module data is presented in a self-describing format.  Each datum
- * is preceeded by a 32-bit identifier and a 32-bit size field.
+ * is preceded by a 32-bit identifier and a 32-bit size field.
  *
  * Currently, the following data are saved:
  *
diff --git a/sys/boot/i386/libi386/bootinfo.c b/sys/boot/i386/libi386/bootinfo.c
index 05d28d1f5d8b..e07ff88c7883 100644
--- a/sys/boot/i386/libi386/bootinfo.c
+++ b/sys/boot/i386/libi386/bootinfo.c
@@ -157,7 +157,7 @@ bi_copyenv(vm_offset_t addr)
  * used as a directory for loaded modules.
  *
  * Module data is presented in a self-describing format.  Each datum
- * is preceeded by a 32-bit identifier and a 32-bit size field.
+ * is preceded by a 32-bit identifier and a 32-bit size field.
  *
  * Currently, the following data are saved:
  *
diff --git a/sys/boot/i386/libi386/bootinfo32.c b/sys/boot/i386/libi386/bootinfo32.c
index 05d28d1f5d8b..e07ff88c7883 100644
--- a/sys/boot/i386/libi386/bootinfo32.c
+++ b/sys/boot/i386/libi386/bootinfo32.c
@@ -157,7 +157,7 @@ bi_copyenv(vm_offset_t addr)
  * used as a directory for loaded modules.
  *
  * Module data is presented in a self-describing format.  Each datum
- * is preceeded by a 32-bit identifier and a 32-bit size field.
+ * is preceded by a 32-bit identifier and a 32-bit size field.
  *
  * Currently, the following data are saved:
  *
diff --git a/sys/boot/i386/libi386/bootinfo64.c b/sys/boot/i386/libi386/bootinfo64.c
index 05d28d1f5d8b..e07ff88c7883 100644
--- a/sys/boot/i386/libi386/bootinfo64.c
+++ b/sys/boot/i386/libi386/bootinfo64.c
@@ -157,7 +157,7 @@ bi_copyenv(vm_offset_t addr)
  * used as a directory for loaded modules.
  *
  * Module data is presented in a self-describing format.  Each datum
- * is preceeded by a 32-bit identifier and a 32-bit size field.
+ * is preceded by a 32-bit identifier and a 32-bit size field.
  *
  * Currently, the following data are saved:
  *
diff --git a/sys/dev/aic7xxx/aic7xxx.h b/sys/dev/aic7xxx/aic7xxx.h
index ecfe1ea98223..f8e81ec8fd68 100644
--- a/sys/dev/aic7xxx/aic7xxx.h
+++ b/sys/dev/aic7xxx/aic7xxx.h
@@ -142,7 +142,7 @@ struct scb_platform_data;
  *	   we must be sure that 4 slots are empty when we write to clear
  *	   the queue.  This reduces us to 253 SCBs: 1 that just completed
  *	   and the known three additional empty slots in the queue that
- *	   preceed it.
+ *	   precede it.
  */
 #define AHC_MAX_QUEUE	253
 
diff --git a/sys/dev/aic7xxx/aic7xxx.seq b/sys/dev/aic7xxx/aic7xxx.seq
index bcb6dccb1488..2a3f44953eb3 100644
--- a/sys/dev/aic7xxx/aic7xxx.seq
+++ b/sys/dev/aic7xxx/aic7xxx.seq
@@ -511,7 +511,7 @@ target_disconnect:
 		mvi	MSG_DISCONNECT call target_outb;
 
 target_busfree_wait:
-		/* Wait for preceeding I/O session to complete. */
+		/* Wait for preceding I/O session to complete. */
 		test	SCSISIGI, ACKI jnz .;
 target_busfree:
 		and	SIMODE1, ~ENBUSFREE;
@@ -1772,7 +1772,7 @@ if ((ahc->flags & AHC_TARGETROLE) != 0) {
  * from out to in, wait an additional data release delay before continuing.
  */
 change_phase:
-	/* Wait for preceeding I/O session to complete. */
+	/* Wait for preceding I/O session to complete. */
 	test	SCSISIGI, ACKI jnz .;
 
 	/* Change the phase */
diff --git a/sys/dev/aic7xxx/aic7xxx_93cx6.c b/sys/dev/aic7xxx/aic7xxx_93cx6.c
index f0f6a532b0b0..42078a5f6d15 100644
--- a/sys/dev/aic7xxx/aic7xxx_93cx6.c
+++ b/sys/dev/aic7xxx/aic7xxx_93cx6.c
@@ -41,7 +41,7 @@
  *     -------------------------------------------------------------------
  *     READ        1    10   A5 - A0             Reads data stored in memory,
  *                                               starting at specified address
- *     EWEN        1    00   11XXXX              Write enable must preceed
+ *     EWEN        1    00   11XXXX              Write enable must precede
  *                                               all programming modes
  *     ERASE       1    11   A5 - A0             Erase register A5A4A3A2A1A0
  *     WRITE       1    01   A5 - A0   D15 - D0  Writes register
diff --git a/sys/gnu/ext2fs/ext2_alloc.c b/sys/gnu/ext2fs/ext2_alloc.c
index 36fda1530d3f..5b04196a5e0a 100644
--- a/sys/gnu/ext2fs/ext2_alloc.c
+++ b/sys/gnu/ext2fs/ext2_alloc.c
@@ -198,7 +198,7 @@ ext2_alloc(ip, lbn, bpref, size, cred, bnp)
  * logical blocks to be made contiguous is given. The allocator attempts
  * to find a range of sequential blocks starting as close as possible to
  * an fs_rotdelay offset from the end of the allocation for the logical
- * block immediately preceeding the current range. If successful, the
+ * block immediately preceding the current range. If successful, the
  * physical block numbers in the buffer pointers and in the inode are
  * changed to reflect the new allocation. If unsuccessful, the allocation
  * is left unchanged. The success in doing the reallocation is returned.
diff --git a/sys/gnu/fs/ext2fs/ext2_alloc.c b/sys/gnu/fs/ext2fs/ext2_alloc.c
index 36fda1530d3f..5b04196a5e0a 100644
--- a/sys/gnu/fs/ext2fs/ext2_alloc.c
+++ b/sys/gnu/fs/ext2fs/ext2_alloc.c
@@ -198,7 +198,7 @@ ext2_alloc(ip, lbn, bpref, size, cred, bnp)
  * logical blocks to be made contiguous is given. The allocator attempts
  * to find a range of sequential blocks starting as close as possible to
  * an fs_rotdelay offset from the end of the allocation for the logical
- * block immediately preceeding the current range. If successful, the
+ * block immediately preceding the current range. If successful, the
  * physical block numbers in the buffer pointers and in the inode are
  * changed to reflect the new allocation. If unsuccessful, the allocation
  * is left unchanged. The success in doing the reallocation is returned.
diff --git a/sys/i386/i386/userconfig.c b/sys/i386/i386/userconfig.c
index 043ed9966db1..034334ea4958 100644
--- a/sys/i386/i386/userconfig.c
+++ b/sys/i386/i386/userconfig.c
@@ -2105,7 +2105,7 @@ dolist(int row, int num, int detail, int *ofs, DEV_LIST **list, char *dhelp)
 		extended=1;
 		break;
 		    
-	    case '[':				/* cheat : always preceeds cursor move */
+	    case '[':				/* cheat : always precedes cursor move */
 	    case 'O':				/* ANSI application key mode */
 		if (extended==1)
 		    extended=2;
@@ -2893,7 +2893,7 @@ introfunc(CmdParm *parms)
 		extended = 1;
 		break;
 		    
-	    case '[':				/* cheat : always preceeds cursor move */
+	    case '[':				/* cheat : always precedes cursor move */
 	    case 'O':				/* ANSI application key mode */
 		if (extended == 1)
 		    extended = 2;
diff --git a/sys/i4b/layer3/i4b_l3fsm.c b/sys/i4b/layer3/i4b_l3fsm.c
index e8e6ad774dcd..bd60d5afb809 100644
--- a/sys/i4b/layer3/i4b_l3fsm.c
+++ b/sys/i4b/layer3/i4b_l3fsm.c
@@ -366,7 +366,7 @@ static void F_01L(call_desc_t *cd)
 	 * we react here as if we received a CALL PROCEEDING because
 	 * several PBX's react with a SETUP ACK even if the called
 	 * number is complete AND we sent a SENDING COMPLETE in the
-	 * preceeding SETUP message. (-hm)
+	 * preceding SETUP message. (-hm)
 	 */
 
 	T310_start(cd);