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.