defect
dih-FEKT
/dɪˈfɛkt/
To abandon a cooperative strategy or alliance in favor of self-interested action.
In game theory, defecting means choosing an uncooperative move to maximize individual payoff, often breaking implicit trust.
The story behind the word. From Latin 'defectus' (abandoned or lacking), constructed from 'de-' (away) and 'facere' (to make or do). Originally used for abandoning allegiance to a nation or cause, game theorists adopted it to label non-cooperative choices in dilemmas.
Word relationships
- betray: 'Betray' carries emotional and moral judgment, while 'defect' in game theory is an analytical term for non-cooperation.
- renege: 'Renege' means to break a specific promise or contract, whereas 'defect' refers to choosing an uncooperative strategic move.
- cooperate: 'Cooperate' means aligning actions for mutual benefit, the direct opposite of defecting.
Commonly confused with
- desert: 'Desert' implies running away from duty or military post, while 'defect' in game theory means choosing self-interest over alignment.
Word family
- defection (noun): The act of abandoning an alliance or cooperative strategy.
- defector (noun): A person or entity that chooses to defect.
Collocations
- temptation to defect
- defect from the agreement
- choose to defect
- defect unexpectedly
Idioms & expressions
- break ranks
Example sentences
- "The decision to defect promises a higher immediate payoff than cooperation in a single round." Evolutionary Game Theory
- "If one oil producer chooses to defect by overproducing, oil prices will drop for the entire cartel." Cartel Stability
Memory hook
To DEFECT is to DEpart from the eFECTive group agreement. Break trust for short-term gain.
When not to use
Do not confuse with the noun form 'defect' ('DEE-fekt'), which means a flaw or imperfection.
Fun facts
- In the famous Prisoner's Dilemma, defecting is the dominant strategy for both players even though mutual cooperation yields a better collective outcome.
Related words
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