geromorphism, coetaneous, coeval, contemporaneous.

agency, n. instrumentality, operation, action, mediation, means.

agent, n. representative, canvasser, substitute, deputy, factor,
procurator, syndic, go-between, commissioner, proctor, emissary, envoy,
solicitor, negotiator. Antonyms: principal, chief.

aggrandize, v. exalt.

aggrandizement, n. exaltation.

aggravate, v. intensify, heighten, enhance, increase; exasperate,
irritate, provoke.

aggravation, n. enhancement, heightening; (Colloq.) exasperation,
provocation, irritation.

aggregate, n. mass, whole, total.

aggregation, n. collection, accumulation, mass.

aghast, a. astounded, terrified, dismayed, horror-struck.

agile, a. nimble, spry, active, lively.

agility, n. spryness, nimbleness, activity.

agitate, v. disturb, shake, unsettle; excite, perturb, disconcert;
discuss, consider.