Etymology
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M.B.A. 

by 1917, American English, abbreviation of Masters of Business Administration, an educational degree attested by that name by 1912.

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photo-electric (adj.)

1863, "acting by the combination of light and electricity;" by 1880 as "producing light by means of electricity," from photo- + electric

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trailer (n.)

1580s, "hound or huntsman that follows a trail," agent noun from trail (v.). From 1610s as "something that trails." By 1890 as "vehicle pulled by another;" originally a small carriage drawn along by a bicycle.

The meaning "advertisement run alongside a motion picture" is attested by 1916; trailer as "length of blank film at the end of a reel" is by 1913. Trailer park "mobile home community" recorded by 1936. Derogatory trailer trash is in use by 1986.

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MapQuest 

internet map service, known by that name from 1996; acquired by AOL in 2000. As a verb, by 1997.

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selfie (n.)

"photograph taken by pointing the camera at oneself," by 2005, said to be in use by 2002, from self + -ie.

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drainage (n.)

1650s, "act or process of draining," from drain (v.) + -age. Sense of "the water carried off by a system of rivers" is by 1860. Meaning "system by means of which something is drained" is by 1878.

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med (n.)

by 1851 as a shortening of medic. As a colloquial shortening of medicine, by 1942. With a capital M and short for Mediterranean, by 1948. Meds as a shortening of medications is attested in hospital jargon by 1965.

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muted (adj.)

by 1840, in reference to musical instruments, past-participle adjective from mute (v.). Figuratively by 1879. Of colors by 1905. Related: mutedness.

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dead end (n.)

"closed end of a passage," 1851 in reference to drainpipes, 1874 in reference to railway lines; by 1886 of streets; from dead (adj.) + end (n.). Figurative use, "course of action that leads nowhere," is by 1914. As an adjective in the figurative sense by 1917; as a verb by 1921. Related: Dead-ended; dead-ending; deadender (by 1996).

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manually (adv.)

"by hand, by means of the hand," late 15c., from manual (adj.) + -ly (2).

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