Half and half. / To describe 2 possible outcomes as being equally likely.

In half: in two equal parts, shares, etc.

(sports) A challenge between two opposing players, where both have an equal chance of taking possession.

plural of fifty-fifty

(countable) A banknote or coin with a denomination of 50. / (cricket) A batsman's score of at least 50 runs and less than 100 runs.

The cardinal number occurring after forty-nine and before fifty-one.

(US slang) Alternative form of 5150.

(US slang) Alternative form of 5150.

Obsolete spelling of fifty (50)

The decade of the 1850s, 1950s, etc. / The decade of one's life from age 50 through age 59. / (temperature, rates, plural only) The range between 50 and 59.