ag- / Indo-European roots
Examples of words with the root ag-: -agogue, act, active, actor, actual, actuary, agendum, agent, agile, agitate, agony, ambage, ambassador, ambiguous, anagoge, axiology, axiom, choragus, chronaxie, coagulum, cogent, demagogue, epact, essay, exact, fumigate, fustigate, glucagon, hypnagogic, intransigent.
To drive, draw, move.Oldest form *ag̑-, becoming *ag- in centum languages.
▲ Derivatives include agony, ambiguous, demagogue, essay, squat.
1. act, active, actor, actual, actuary, actuate, agendum, agent, agile, agitate; allege, ambage, ambiguous, assay, cache, coagulum, cogent, essay, exact, exacta, examine, exigent, exiguous, fumigate, fustigate, intransigent, levigate, litigate, navigate, objurgate, prodigal, redact, retroactive, squat, transact, variegate from Latin agere, to do, act, drive, conduct, lead, weigh.
2. -agogue, agony; anagoge, antagonize, choragus, demagogue, epact, glucagon, hypnagogic, mystagogue, pedagogue, protagonist, stratagem, synagogue from Greek agein, to drive, lead, weigh.
3. Suffixed form *ag-to-. ambassador, embassage, embassy from Latin ambactus, servant, from Celtic *amb(i)-ag-to-, "one who goes around" (*ambi, around; see ambhi)
4. Suffixed form *ag-ti-, whence adjective *ag-ty-o-, "weighty" axiom; axiology, chronaxie from Greek axios, worth, worthy, of like value, weighing as much.
5. Possibly suffixed form *ag-ro-, driving, pursuing, grabbing. pellagra, podagra from Greek agrā, a seizing.
6. O-grade suffixed form *og-mo-, furrow, track, metaphorically "incised line" ogham from Old Irish Ogma (from Celtic *Ogmios), name of a Celtic god and traditional inventor of the ogham alphabet.
[Pokorny ag̑- 4.]