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aggravated (adj.)[aggravated 词源字典]: 1540s, "increased, magnified," past participle adjective from aggravate. Meaning "irritated" is from 1610s; that of "made worse" is from 1630s. The earlier adjective was simply aggravate (late 15c.).[aggravated etymology, aggravated origin, 英语词源]
aggravation (n.): late 15c., from Middle French aggravation, from Late Latin aggravationem (nominative aggravatio), noun of action from past participle stem of Latin aggravare "make heavier," figuratively "to embarrass further, increase in oppressiveness," from ad "to" (see ad-) + gravare "weigh down," from gravis "heavy" (see grave (adj.)). Oldest sense is "increasing in gravity or seriousness;" that of "irritation" is from 1610s.
aggregate (adj.): c. 1400, from Latin aggregatus "associated," literally "united in a flock," past participle of aggregare "add to (a flock), lead to a flock, bring together (in a flock)," from ad- "to" (see ad-) + gregare "herd" (see gregarious).
aggregate (v.): c. 1400, from Latin aggregatum, neuter past participle of aggregare (see aggregate (adj.)). Related: Aggregated; aggregating.
aggregate (n.): "number of persons, things, etc., regarded as a unit," early 15c., from noun use of Latin adjective aggregatum, neuter of aggregatus (see aggregate (adj.)).
aggregation (n.): early 15c., from Middle French agrégation or directly from Medieval Latin aggregationem (nominative aggregatio), noun of action from past participle stem of Latin aggregare (see aggregate (adj.)).
aggress (v.): "attack," 1714, back-formation from aggression, but used earlier with a sense of "approach" (1570s) and in this sense from French aggresser, from Late Latin aggressare, frequentative of Latin aggredi "to approach, attack." Related: Aggressed; aggressing.
aggression (n.): 1610s, "unprovoked attack," from French aggression (16c.), from Latin aggressionem (nominative aggressio) "a going to, an attack," noun of action from past participle stem of aggredi "to approach; attack," from ad- "to" (see ad-) + gradi (past participle gressus) "to step," from gradus "a step" (see grade (n.)). Psychological sense of "hostile or destructive behavior" first recorded 1912 in A.A. Brill's translation of Freud.
aggressive (adj.): 1791, from Latin aggress-, past participle stem of aggredi "to approach, attack" (see aggression) + -ive. In psychological use from 1913, first in translations of Freud. Related: Aggressively; aggressiveness.
aggressor (n.): 1670s, from Latin aggressor, agent noun from aggredi "to approach, attack" (see aggression).
aggrieve (v.): early 14c., from Old French agrever "make worse; become worse," from Latin aggravare "make heavier" (see aggravation). Related: Aggrieved; aggrieving.
aggrieved (adj.): "oppressed in spirit," mid-14c., past participle adjective from aggrieve. The legal sense of "injured or wronged in one's rights" is from 1580s.
aghast (adj.): c. 1300, agast, "terrified," past participle of Middle English agasten "to frighten" (c. 1200), from a- intensive prefix + Old English gæstan "to terrify," from gæst "spirit, ghost" (see ghost). The -gh- spelling appeared early 15c. in Scottish and is possibly a Flemish influence, or after ghost, etc. It became general after 1700.
agile (adj.): 1580s, from Middle French agile (14c.) and directly from Latin agilis "nimble, quick," from agere "to move, drive" (see act (n.)). Related: Agilely.
agility (n.): early 15c., from Old French agilité (14c.), from Latin agilitatem (nominative agilitas) "mobility, nimbleness, quickness," from agilis, from agere "to move" (see act (n.)).
agism (n.): alternative spelling of ageism.
agitate (v.): 1580s, "to disturb," from Latin agitatus, past participle of agitare "to put in constant motion, drive onward, impel," frequentative of agere "to move, drive" (see agitation). Literal sense of "move to and fro, shake" is from 1590s. Related: Agitated; agitating.
agitated (adj.): 1610s, "set in motion," past participle adjective from agitate (v.). Meaning "disturbed" is from 1650s; that of "disturbed in mind" is from 1756. Meaning "kept constantly in public view" is from 1640s.
agitation (n.): 1560s, "mental tossing to and fro," from French agitation, from Latin agitationem (nominative agitatio) "motion, agitation," noun of action from past participle stem of agitare "move to and fro," frequentative of agere in its sense of "to drive" (see act (n.)).
agitator (n.): 1640s, agent noun from agitate (v.); originally "elected representative of the common soldiers in Cromwell's army," who brought grievances (chiefly over lack of pay) to their officers and Parliament.

Political sense is first recorded 1734, and negative overtones began with its association with Irish patriots such as Daniel O'Connell (1775-1847). Historically, in American English, often with outside and referring to people who stir up a supposedly contented class or race. Latin agitator meant "a driver, a charioteer."