From WordNet (r) 3.0 (2006) [wn]:
enclosure
n 1: a structure consisting of an area that has been enclosed
for some purpose
2: the act of enclosing something inside something else [syn:
enclosure, enclosing, envelopment, inclosure]
3: a naturally enclosed space [syn: enclosure, {natural
enclosure}]
4: something (usually a supporting document) that is enclosed in
an envelope with a covering letter [syn: enclosure,
inclosure]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Inclosure \In*clo"sure\ (?; 135), n. [See Inclose,
Enclosure.] [Written also enclosure.]
[1913 Webster]
1. The act of inclosing; the state of being inclosed, shut
up, or encompassed; the separation of land from common
ground by a fence.
[1913 Webster]
2. That which is inclosed or placed within something; a thing
contained; a space inclosed or fenced up.
[1913 Webster]
Within the inclosure there was a great store of
houses. --Hakluyt.
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3. That which incloses; a barrier or fence.
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Breaking our inclosures every morn. --W. Browne.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Enclosure \En*clo"sure\ (?; 135), n.
Inclosure. See Inclosure.
[1913 Webster]
Note: The words enclose and enclosure are written
indiscriminately enclose or inclose and enclosure or
inclosure.
[1913 Webster]