Etymology
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multi- 

before vowels mult-, word-forming element meaning "many, many times, much," from combining form of Latin multus "much, many," from PIE *ml-to-, from root *mel- (2) "strong, great, numerous." It was much-used in forming Latin compounds in classical times and after (such as multianimis "having much courage," multibibus "much-drinking," multicomus "having much hair," multiloquus "talkative"). Many English words that use it (multinational, etc.) are 20c. coinages.

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multi-use (adj.)

1941, "designed for different functions," from multi- "many" + use (n.). By 1945 as "designed to be used more than once," from multi- in the sense of "many times."

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multi-ply (adj.)

"having several layers or webs," 1887, from multi- "many" + ply (n.) "a layer, a fold."

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multi-millionaire (n.)

also multimillionaire, "one worth many millions" (of dollars, pounds, etc.), 1858, from multi- "many times" + millionaire.

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multitasking (n.)

also multi-tasking, "concurrent execution of a number of different activities," 1966, originally in computing, from multi- "many" + tasking (see task (n.)). Of humans, by 1998. Related: Multitask (v.), by 1987. As an adjective, multi-task is recorded from 1954 in a non-computer mechanical context.

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multilineal (adj.)

also multi-lineal, "having many lines," 1800, from multi- + lineal. Multi-linear is by 1815.

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multistory (adj.)

also multi-story, multi-storey, "of many stories or floors," 1907, from multi- "many" + story (n.2).

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task (v.)
1520s, "impose a task upon;" 1590s, "to burden, put a strain upon," from task (n.). Related: Tasked; tasking.
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multicolored (adj.)

also multi-colored, multi-coloured, "having many or various colors," 1819, from multi- "many" + colored. Late Latin had multicolorus "many-colored."

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multilayer (adj.)

also multi-layer, "composed of or occurring in many layers," 1907, from multi- "many" + layer (n.). Related: Multi-layered (1895).

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