n.
<美>月票

[ noun ]
a ticket good for several trips or to attend a season of entertainments; sold at a reduced rate
<noun.communication>

Commutation \Com`mu*ta"tion\, n. [L. commutatio: cf. F.
commutation.]
1. A passing from one state to another; change; alteration;
mutation. [R.]

So great is the commutation that the soul then hated
only that which now only it loves. --South.

2. The act of giving one thing for another; barter; exchange.
[Obs.]

The use of money is . . . that of saving the
commutation of more bulky commodities. --Arbuthnot.

3. (Law) The change of a penalty or punishment by the
pardoning power of the State; as, the commutation of a
sentence of death to banishment or imprisonment.

Suits are allowable in the spiritual courts for
money agreed to be given as a commutation for
penance. --Blackstone.

4. A substitution, as of a less thing for a greater, esp. a
substitution of one form of payment for another, or one
payment for many, or a specific sum of money for
conditional payments or allowances; as, commutation of
tithes; commutation of fares; commutation of copyright;
commutation of rations.

5. regular travel from a place of residence to a place where
one's daily work is performed; commuting. Most often, such
travel is performed between a suburb and a nearby city.

{Angle of commutation} (Astron.), the difference of the
geocentric longitudes of the sun and a planet.

{Commutation of tithes}, the substitution of a regular
payment, chargeable to the land, for the annual tithes in
kind.

{Commutation ticket}, a ticket, as for transportation, which
is the evidence of a contract for service at a reduced
rate. See 2d {Commute}, 2.


Commutation ticket \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.''
[Webster 1913 Suppl.]