All 3 Uses

expedient
in
Obasan
(Auto-generated)

Grandma Nakane, Uncle's mother, was too old then to understand political expediency, race riots, the yellow peril.†
Chpt 4

expediency = convenient, speedy, or practical; or an action that is speedy or practical
Expedience still demands decisions which will one day be judged unjust.
Chpt 7 *

expedience = the need for practical actions
There were a few politicians sitting up late into the night, weighing conscience against expedience.†
Chpt 27

expedience = convenience, speediness, or practicality

Definitions:

(1) (expedient)
convenient and practical, but sometimes not the best or most moral choice
(2) (meaning too rare to warrant focus)
Much more rarely, expedient can also imply that an action was taken for reasons of self-interest rather than for moral reasons.

In the sense of speedy, the word is less commonly used today than in the past; though it may still be used as in "an expedient end" or "an expedient amount of time," or "We are depending upon your expediency."