\Com`mu*ta"tion tick"et\
A ticket for transportation at a reduced rate in
consideration of some special circumstance, as increase of
travel; specif., a ticket for a certain number of, or for
daily, trips between neighboring places at a reduced rate,
such as are commonly used by those doing business in a city
and living in a suburb. Commutation tickets are excepted from
the prohibition against special rates contained in the
Interstate Commerce Act of Feb. 4, 1887 (--24 Stat. 379), and
in 145 U. S. 263 it was held that party tickets were also
excepted as being ``obviously within the commuting
principle.''