Etymology
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aid (n.)

early 15c., aide, "war-time tax," also "help, support, assistance," from Old French aide, earlier aiudha "aid, help, assistance," from Late Latin adiuta, noun use of fem. of adiutus, past participle of Latin adiuvare "to give help to," from ad "to" (see ad-) + iuvare "to help, give strength, support, sustain," which is from a PIE source perhaps related to the root of iuvenis "young person" (see young (adj.)).

The meaning "thing by which assistance is given" is recorded from 1590s; the sense of "person who assists, helper" is from 1560s. The meaning "material help given by one country to another" is from 1940.

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aid (v.)

"to assist, help," c. 1400, aiden, from Old French aidier "help, assist" (Modern French aider), from Latin adiutare, frequentative of adiuvare (past participle adiutus) "to give help to," from ad "to" (see ad-) + iuvare "to help, assist, give strength, support, sustain," which is from a PIE source perhaps related to the root of iuvenis "young person" (see young (adj.)). Related: Aided; aiding.

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Band-Aid (n.)
trademark name (Johnson & Johnson) for a stick-on gauze pad or strip, by 1922. See band (n.1) + aid (n.). The British equivalent was Elastoplast. Figurative sense of "temporary or makeshift solution to a problem, pallative" (often lower case, sometimes bandaid) is attested by 1968; as an adjective in this sense, by 1970.
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unaided (adj.)
1660s, from un- (1) "not" + past participle of aid (v.).
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aide (n.)
"officer whose duty is to receive and communicate the orders of a general officer," 1777, short for aide-de-camp (1660s), a French term in English, literally "camp assistant" (see aid (n.)). Plural of the full term is aides-de-camp.
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Medicaid 

"system for providing public funds to persons needing assistance with medical expenses," 1966; see medical (adj.) + aid (n.). The U.S. medical assistance program was created by Title XIX of the Social Security Act of 1965. 

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jury (adj.)
"temporary," 1610s (in jury-mast, a nautical term for a temporary mast put in place of one broken or blown away), a sailors' word of uncertain origin. Perhaps it is ultimately from Old French ajurie "help, relief," from Latin adjutare (see aid (n.)). Jury-leg for "wooden leg" is from 1751; Denham once used jury-buttocks.
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*ad- 
Proto-Indo-European root meaning "to, near, at."

It forms all or part of: abate; ado; ad-; ad hoc; ad lib; adage; adagio; add; adjective; adore; adorn; adult; adverb; advertise; agree; aid; alloy; ally; amontillado; amount; assure; at; atone; exaggerate; paramount; rapport; twit.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit adhi "near;" Latin ad "to, toward;" Old English æt.
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succor (n.)
c. 1200, socour, earlier socours "aid, help," from Anglo-French succors "help, aid," Old French socors, sucurres "aid, help, assistance" (Modern French secours), from Medieval Latin succursus "help, assistance," from past participle of Latin succurrere "run to help, hasten to the aid of," from assimilated form of sub "up to" (see sub-) + currere "to run" (from PIE root *kers- "to run"). Final -s mistaken in English as a plural inflection and dropped late 13c. Meaning "one who aids or helps" is from c. 1300.
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leg up (n.)
"an aid, a boost," 1837, from leg (n.) + up (adv.).
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