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A logical or of several (generally more than 2) "terms". Since logical or is an associative binary operation, this makes sense.

Often denoted with a large "", used like a \sum (Sigma) or an integral sign: x1 ∨ ... ∨ xn is

    n
\  /
\/     x
i = 1    i


Dis*junc"tion (?), n. [L. disjunctio.]

1.

The act of disjoining; disunion; separation; a parting; as, the disjunction of soul and body.

2.

A disjunctive proposition.

Coleridge.

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