Prefixes

Common Prefixes

Prefix	Meaning	Example
a-, an-	without	amoral
ante-	before	antecedent
anti-	against	anticlimax
auto-	self	autopilot
circum-	around	circumvent
co-	with	copilot
com-, con-	with	companion, contact
contra-	against	contradict
de-	off, away from	devalue
dis-	not	disappear
en-	put into	enclose
ex-	out of, former	extract, ex-president
extra-	beyond, more than	extracurricular
hetero-	different	heterosexual
homo-	same	homonym
hyper-	over, more	hyperactive
il-, im-, in-, ir-	not, without	illegal, immoral, inconsiderate, irresponsible
in-	into	insert
inter-	between	intersect
intra-	between	intravenous
macro-	large	macroeconomics
micro-	small	microscope
mono-	one	monocle
non-	not, without	nonentity
omni-	all, every	omniscient
post-	after	postmortem
pre-, pro-	before, forward	precede, project
sub-	under	submarine
syn-	same time	synchronize
trans-	across	transmit
tri-	three	tricycle
un-	not	unfinished
uni-	one	unicorn