Definition of "martingale" in English

noun

1. A piece of harness used on a horse to keep it from raising its head above a desired point.

2. (nautical) A spar, or piece of rigging that strengthens the bowsprit.

3. (mathematics) A stochastic process for which the conditional expectation of future values given the sequence of all prior values is equal to the current value.

   • If a gambler plays a fair game repeatedly, his payoff over time is a martingale.

4. A gambling strategy in which one doubles the stake after each loss.

5. (fencing) A strap attached to the sword handle, preventing a sword being dropped if disarmed.

verb

1. To employ the martingale strategy in gambling.