expediency

Short definition from Wiktionary

Noun

1. 1
   The quality of being fit or suitable to effect some desired end or the purpose intended; suitability for particular circumstance or situation.
2. 2
   Pursuit of the course of action that brings the desired effect even if it is unjust or unprincipled.
3. 3
   Haste; dispatch.
4. 4
   An expedient.