a room or a group of related rooms, among similar sets in one building, designed for use as a dwelling.
a building containing or made up of such rooms.
any separated room or group of rooms in a house or other dwelling: We heard cries from an apartment at the back of the house.
apartments, British. a set of rooms used as a dwelling by one person or one family.

1635–45; < French appartement < Italian appartamento, equivalent to apparta(re) to separate, divide (verbal derivative of a parte apart, to one side) + -mento -ment

apartmental [uh-pahrt-men-tl] , adjective

1. Apartment, compartment agree in denoting a space enclosed by partitions or walls. Apartment however, emphasizes the idea of separateness or privacy: one's own apartment. Compartment suggests a section of a larger space: compartments in a ship's hold, in an orange crate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
apartment (əˈpɑːtmənt)
1.  (often plural) any room in a building, usually one of several forming a suite, esp one that is spacious and well furnished and used as living accommodation, offices, etc
2.  a.  another name (esp US and Canadian) for flat
 b.  (as modifier): apartment building; apartment house
[C17: from French appartement, from Italian appartamento, from appartare to set on one side, separate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1640s, "private rooms for the use of one person within a house," from Fr. appartement (16c.), from It. appartimento, lit. "a separated place," from appartere "to separate," from a "to" + parte "side, place," from L. partem (see part). Sense of "set of private rooms in a building
entirely of these" (the U.S. equivalent of British flat) is first attested 1874.
Online Etymology Dictionary, © 2010 Douglas Harper
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