c. 1600, "public exhibition," from expose (v.) + -ure. Sense of "situation with regard to sun or weather" is from 1660s. Photographic sense "act of exposing to light" is from 1839. Indecent exposure attested by 1825.
early 15c., "to leave without shelter or defense," from Old French esposer, exposer "lay open, set forth, speak one's mind, explain" (13c.), from Latin exponere "set forth, lay open, exhibit, reveal, publish," from ex "from, forth" (see ex-) + ponere "to put, place" (see position (n.)). Altered in French by confusion with poser "to place, lay down" (see pose (v.1)). Meaning "to exhibit openly" is from 1620s; that of "to unmask" is from 1690s. Photographic sense is from 1839. Related: Exposed; exposes; exposing.
also over-exposure, "excessive exposure; an excess of exposure," 1834 in reference to cleavage in women's dress; 1855 in photography, from over- + exposure. Figurative sense, in reference to celebrity, is attested from 1969.
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Definitions of exposure from WordNet
vulnerability to the elements; to the action of heat or cold or wind or rain;
exposure to the weather
they died from exposure
the act of subjecting someone to an influencing experience;
she denounced the exposure of children to pornography
the disclosure of something secret;
they feared exposure of their campaign plans
aspect resulting from the direction a building or window faces;