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The Collaborative International Dictionary of English v.0.48 (gcide)

Exclude \Ex*clude"\, v. t. [imp. & p. p. {Excluded}; p. pr. &
vb. n. {Excluding}.] [L. excludere, exclusum; ex out
claudere to shut. See {Close}.]
1. To shut out; to hinder from entrance or admission; to
debar from participation or enjoyment; to deprive of; to
except; -- the opposite to admit; as, to exclude a crowd
from a room or house; to exclude the light; to exclude one
nation from the ports of another; to exclude a taxpayer
from the privilege of voting.
[1913 Webster]

And none but such, from mercy I exclude. --Milton.
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2. To thrust out or eject; to expel; as, to exclude young
animals from the womb or from eggs.
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{Excluded middle}. (logic) The name given to the third of the
"three logical axioms," so-called, namely, to that one
which is expressed by the formula: "Everything is either A
or Not-A." no third state or condition being involved or
allowed. See {Principle of contradiction}, under
{Contradiction}.
[1913 Webster]