binary decision
nounUK /ˈbaɪ.nər.i dɪˈsɪʒ.ən/
US /ˈbaɪ.nɛr.i dɪˈsɪʒ.ən/
A binary decision is a choice between only two things, like yes or no.
Choosing whether to wear a hat is a binary decision: you either wear one or you don't.
OTHER MEANINGS
2. In computing, a decision that produces one of two possible outcomes, such as true or false.
The program makes a binary decision at each step: continue the loop or stop.
3. A situation where only two possible courses of action exist, with no middle ground.
Voters faced a binary decision: approve the plan or reject it.
4. A logical test in which a condition is either met or not met.
The thermostat makes a binary decision based on whether the room is too cold.