From The Collaborative International Dictionary of English v.0.48 [gcide]:
Limousine \Li'mou*sine"\, noun [Cf. F. limousine a kind of cloak, fr. Limousin, an old province in central France.] an elongated, luxurious automobile, designed to be driven by a chauffeur and often having a glass partition between the driver's seat and the passengers' compartment behind.
Note: When intended for use in transporting businessmen, the limousine may be equipped with a telephone and other conveniences to permit work during travel. Limousines are often rented for travel to and from airports, and as a luxurious perquisite on special occasions, as weddings or school prm nights. Originally (1913) the term referred to an automobile body with seats and permanent top like a coup['e], and with the top projecting over the driver and a projecting front, or an automobile with such a body. [Webster 1913 Suppl. +PJC]
From WordNet (r) 3.0 (2006) [wn]:
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