/vee"i keuhl/ or, sometimes, /vee"hi-/, n.
1. any means in or by which someone travels or something is carried or conveyed; a means of conveyance or transport: a motor vehicle; space vehicles.
2. a conveyance moving on wheels, runners, tracks, or the like, as a cart, sled, automobile, or tractor.
3. a means of transmission or passage: Air is the vehicle of sound.
4. a carrier, as of infection.
5. a medium of communication, expression, or display: The novel is a fitting vehicle for his talents. Language is the vehicle of thought.
6. Theat., Motion Pictures. a play, screenplay, or the like, having a role suited to the talents of and often written for a specific performer.
7. a means of accomplishing a purpose: College is a vehicle for success.
8. Rhet. the thing or idea to which the subject of a metaphor is compared, as "rose" in "she is a rose." Cf. tenor (def. 3).
9. Pharm. a substance, usually fluid, possessing little or no medicinal action, used as a medium for active remedies.
10. Painting. a liquid, as oil, in which a pigment is mixed before being applied to a surface.
[1605-15; < L vehiculum, equiv. to veh(ere) to convey + -i- -I- + -culum -CLE2]
Pronunciation. Because the primary stress in vehicle is on the first syllable, the /h/ in the second syllable tends to disappear: /vee"i keuhl/. A pronunciation with primary stress on the second syllable and a fully pronounced /h/ is usually considered nonstandard: /vee hik"euhl/. In the adjective vehicular, where the primary stress is normally on the second syllable, the /h/ is always pronounced.

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(as used in expressions)
multiple independently targeted reentry vehicle
air cushion vehicle

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Universalium. 2010.