Wiktionary
a. Of or pertaining to a contest, election, or other competition in which only the winner is rewarded and none of the losers get anything. alt. Of or pertaining to a contest, election, or other competition in which only the winner is rewarded and none of the losers get anything.
Wikipedia
Winner-take-all is a computational principle applied in computational models of neural networks by which neurons in a layer compete with each other for activation. In the classical form, only the neuron with the highest activation stays active while all other neurons shut down, however other variations that allow more than one neuron to be active do exist, for example the soft winner take-all, by which a power function is applied to the neurons.
Usage examples of "winner-take-all".
The only other person who has said anything about taking a dive for Nixon in November is Hubert Humphrey, who has already threatened in public -- at the party's Credentials Committee hearings in Washington last week -- to let his friend Joe Alioto, the Mayor of San Francisco, throw the whole state of California to Nixon unless the party gives Hubert 151 California delegates -- on the basis of his losing show of strength in that state's winner-take-all primary.
The only other person who has said anything about taking a dive for Nixon in November is Hubert Humphrey, who has already threatened in public -- at the party's Credentials Committee hearings in Washington last week -- to let his friend Joe Alioto, the Mayor of San Francisco, throw the whole state of California to Nixon unless the party gives Hubert 151 California delegates -- on the basis of his losing show of strength in that state's winner-take-all primary.