early 14c., "an attack of fever," from Old French acces "onslaught, attack; onset (of an illness)" (14c.), from Latin accessus "a coming to, an approach; way of approach, entrance," noun use of past participle of accedere "to approach," from assimilated form of ad "to" (see ad-) + cedere "go, move, withdraw" (from PIE root *ked- "to go, yield"). English sense of "an entrance" (c. 1600) is directly from Latin. Meaning "habit or power of getting into the presence of (someone or something)" is from late 14c.
1962, originally in computing, from access (n.). Related: Accessed; accessing.
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