secularize vs secularise

secularize and secularise both are verbs.

Word	Noun	Adjective	Verb	Adverb
secularize	No	No	Yes	No
secularise	No	No	Yes	No

As verbs, secularize and secularise are synonyms defined as:

secularize and secularise: make secular and draw away from a religious orientation

secularize (verb)	secularise (verb)
make secular and draw away from a religious orientation	make secular and draw away from a religious orientation
transfer from ecclesiastical to civil possession, use, or control