PREFIXES

A prefix is a word or syllable placed before another word, and so completely joined to it that it changes the meaning of the basic word.

Note to Teacher:—Have the pupils select in the lessons of your grade, words which have similar prefixes.

As you can see in the list below, the final consonant of a prefix has often been changed to make the pronunciation easier, but does not disappear when added to the stem. Thus, ad-cord became ac-cord, ad-fect became af-fect, etc.

Prefix	Definition	Illustration
ab (abs, a)	from, away	abandon
ad (ac, af, ag, al, an, ap, ar, as, at)	to	accommodate
ante	before	antecedent
circum	about, around	circumstance
com (co, col, con, cor)	with, together	compare, concert
de	from, down, away	desert, debate
dis (dif, de)	apart, not	disobey
ex (e, ef)	out, out of, away from, off, beyond	expect
extra	out of	extraordinary
in (ill, im, ir)	in, into, not, without	inside
inter	among, between, mutually	interurban
non	not	nonsense
per	through, by, for	perhaps
post	behind, after	postpone
pre	before	prevent
pro	forward, before, instead	provide
re	back, again, against	return
se	aside, apart, without	separate
sub (suc, suf, sug, sup, sur)	under, below, near	subject, succeed
super	over, above, beyond	superintendent
trans (tran, tra)	across, over, beyond, through	transfer, travel