a-/an-
not/without (a- before consonants; an- before vowels)
ab-
away from
ad-
toward
a-
not/without (before consonants)
an-
not/without (before vowels)
ante-/pre-/pro-
before
ante-
before
pre-
before
pro-
before
anti-/contra-
aganist
anti-
aganist
contra-
aganist
bi-/di-
two
brady-
slow
de-
down from, removing
dia-
through, between, across
bi-
two
di-
two
dys-
difficult/abnormal
ecto-/ex-/exo-
outside/without/away from
ecto-
outside/without/away from
ex-
outside/without/away from
exo-
outside/without/away from
en-/endo-/em-/eso-
inside