01 A running or going out or forth; an expedition; a sally.
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2.
A journey chiefly for recreation; a pleasure trip; a brief tour; as, an excursion into the country.
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3.
A wandering from a subject; digression.“I am not in a scribbling mood, and shall therefore make no excursions.” — Cowper.
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4.
Length of stroke, as of a piston; stroke. [An awkward use of the word.](Mach.)