English Prefixes: Complete Reference

Understand word formation and expand your vocabulary through prefixes.

Definition: A prefix is an affix placed before the base/stem of a word to alter its grammatical meaning or create an antonym.

Prefix	Meaning	Examples
un-	not, opposite of	unhappy, unlock, unpredictable
dis-	reverse, remove	disagree, disconnect, disappear
re-	again, back	rewrite, rebuild, reconsider
pre-	before	preview, prepaid, preheat
mis-	wrongly, badly	misunderstand, mislead, misplace
sub-	under, below	submarine, subway, subtitle
over-	too much, excessive	overestimate, overcook, overflow
anti-	against, opposing	antibiotic, antifreeze, antisocial