The cardinal number immediately following sixty-six and preceding sixty-eight.

The cardinal number immediately following sixty-four and preceding sixty-six.

The cardinal number immediately following sixty-five and preceding sixty-seven.

The cardinal number immediately following sixty and preceding sixty-two.

(US, New York, informal) A police officer's report detailing a crime reported by a civilian.

The cardinal number immediately following sixty-two and preceding sixty-four.

The cardinal number immediately following sixty-one and preceding sixty-three.

The sound generated by the alternation of current in electronic devices.

(basketball, US, informal) The sixteen teams participating in the regional semifinals of the NCAA Division I tournament, one of whom will become the national champion.

(education) In England, the final two years of secondary school, during which students are about sixteen to eighteen years of age.