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1 a :
a going out or forth : expedition
a usually brief pleasure trip
a trip at special reduced rates
deviation from a direct, definite, or proper course; especially : digression
a movement outward and back or from a mean
position or axis; also :
the distance traversed : amplitude
Lewis Carroll's Through The Looking Glass
is an excursion
into a fantastical world where nothing is what it seems to be, and everything appears to be what it is not.