diff --git a/lisp/org-ctags.el b/lisp/org-ctags.el
index 41775bdab..faf543be1 100644
--- a/lisp/org-ctags.el
+++ b/lisp/org-ctags.el
@@ -63,19 +63,19 @@
 ;; with the same name as the link; then, if unsuccessful, ask the user if
 ;; he/she wants to rebuild the 'TAGS' database and try again; then ask if
 ;; the user wishes to append 'tag' as a new toplevel heading at the end of
-;; the buffer; and finally, defer to org's default behaviour which is to
+;; the buffer; and finally, defer to org's default behavior which is to
 ;; search the entire text of the current buffer for 'tag'.
 ;;
-;; This behaviour can be modified by changing the value of
+;; This behavior can be modified by changing the value of
 ;; ORG-CTAGS-OPEN-LINK-FUNCTIONS. For example I have the following in my
-;; .emacs, which describes the same behaviour as the above paragraph with
+;; .emacs, which describes the same behavior as the above paragraph with
 ;; one difference:
 ;;
 ;; (setq org-ctags-open-link-functions
 ;;       '(org-ctags-find-tag
 ;;         org-ctags-ask-rebuild-tags-file-then-find-tag
 ;;         org-ctags-ask-append-topic
-;;         org-ctags-fail-silently))  ; <-- prevents org default behaviour
+;;         org-ctags-fail-silently))  ; <-- prevents org default behavior
 ;;
 ;;
 ;; Usage
diff --git a/lisp/ox-html.el b/lisp/ox-html.el
index b6a3a7e4f..014a6e7ad 100644
--- a/lisp/ox-html.el
+++ b/lisp/ox-html.el
@@ -581,7 +581,7 @@ The function must accept two parameters:
 The function should return the string to be exported.
 
 For example, the variable could be set to the following function
-in order to mimic default behaviour:
+in order to mimic default behavior:
 
 The default value simply returns the value of CONTENTS."
   :group 'org-export-html
diff --git a/lisp/ox-latex.el b/lisp/ox-latex.el
index 2c71f7d78..f6f3b220b 100644
--- a/lisp/ox-latex.el
+++ b/lisp/ox-latex.el
@@ -589,7 +589,7 @@ The function must accept six parameters:
 The function should return the string to be exported.
 
 For example, the variable could be set to the following function
-in order to mimic default behaviour:
+in order to mimic default behavior:
 
 \(defun org-latex-format-inlinetask \(todo type priority name tags contents\)
 \"Format an inline task element for LaTeX export.\"
diff --git a/lisp/ox-publish.el b/lisp/ox-publish.el
index 180764ee6..771aa00f4 100644
--- a/lisp/ox-publish.el
+++ b/lisp/ox-publish.el
@@ -228,7 +228,7 @@ If you create a site-map file, adjust the sorting like this:
   `:sitemap-sort-files'
 
     The site map is normally sorted alphabetically.  You can
-    change this behaviour setting this to `anti-chronologically',
+    change this behavior setting this to `anti-chronologically',
     `chronologically', or nil.
 
   `:sitemap-ignore-case'
diff --git a/lisp/ox.el b/lisp/ox.el
index 72cf4006b..56d0a9f8b 100644
--- a/lisp/ox.el
+++ b/lisp/ox.el
@@ -493,7 +493,7 @@ t           Allow export of math snippets."
   "The last level which is still exported as a headline.
 
 Inferior levels will usually produce itemize or enumerate lists
-when exported, but back-end behaviour may differ.
+when exported, but back-end behavior may differ.
 
 This option can also be set with the OPTIONS keyword,
 e.g. \"H:2\"."
@@ -1736,13 +1736,13 @@ Assume buffer is in Org mode.  Narrowing, if any, is ignored."
 		      (t
 		       ;; Options in `org-export-options-alist'.
 		       (dolist (property (funcall find-properties key))
-			 (let ((behaviour (nth 4 (assq property options))))
+			 (let ((behavior (nth 4 (assq property options))))
 			   (setq plist
 				 (plist-put
 				  plist property
 				  ;; Handle value depending on specified
 				  ;; BEHAVIOR.
-				  (case behaviour
+				  (case behavior
 				    (space
 				     (if (not (plist-get plist property))
 					 (org-trim val)