IPA: /ɪkˈspiːdiənsi/
KK: /ɛkˈspidɪənsi/
The quality of being suitable or convenient for a particular purpose, often in a way that is self-serving or practical rather than principled.
The decision was made out of expediency rather than a commitment to fairness.
Expediency is formed from "ex-" (meaning out of or from) and "pedis" (from Latin "pes", meaning foot). The word originally referred to the act of being suitable or advantageous, as if one is moving forward or out with their feet, suggesting a practical approach to a situation.
Think of 'moving out' ('ex-') with your 'foot' ('pedis') to remember that expediency means taking a practical or advantageous approach.