Possibly suffixed form *ag-ro‑, driving, pursuing, grabbing.

Suffixed form *ag-ti‑, whence adjective *ag-ty-o‑, 'weighty.' axiom axiology, chronaxie, from Greek axios, worth, worthy, of like value, weighing as much.

ambassador, embassage, embassy, from Latin ambactus, servant, from Celtic *amb(i)-ag-to‑, 'one who goes around' ( *ambi, around see ambhi).

-agogue, agony anagoge, antagonize, choragus, demagogue, epact, glucagon, hypnagogic, mystagogue, pedagogue, protagonist, stratagem, synagogue, from Greek agein, to drive, lead, weigh.

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.

Oldest form *ag̑‑, becoming *ag‑ in centum languages.ĭerivatives include agony, ambiguous, demagogue, essay, and squat.

Celtic *ad‑, to, at, in compound *to-ad-ni-sed‑ (see sed-).

ad-, -ad adjuvant, aid, amount, paramount, from Latin ad, ad‑, to, toward.

at atone, twit, from Old English æt, near, by, at.

The American Heritage Dictionary of Indo-European Roots provides even greater detail on this subject.

The American Heritage Dictionary Indo-European Roots Appendix For instructions on how to use this appendix, please refer to the Guide to the Indo-European Roots Appendix.

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