Latin word adagium comes from Latin ad ((direction) toward, to, on, up to, for.), Latin aio (I say, I assert, I say yes, I say no, I affirm, I assent.)
ad (Latin)
(direction) toward, to, on, up to, for.
aio (Latin)
I say, I assert, I say yes, I say no, I affirm, I assent.
adagium (Latin)
Proverb, adage.