second

1. second (noun) — sense 1

Definition: A unit of time historically and commonly defined as a sixtieth of a minute which the International System of Units more precisely defines as the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of caesium-133 in a ground state at a temperature of absolute zero and at rest.

Example: Holonyms: decasecond < minute < hectosecond < kilosecond < hour < day < week < megasecond < fortnight < month < year < gigasecond < century < kiloannum, kiloyear, millennium < terasecond < mega-annum, megayear < petasecond < giga-annum, gigayear < exasecond < zettasecond < yottasecond < ronnasecond < quettasecond

2. second (noun) — sense 2

Definition: A unit of angle equal to one-sixtieth of a minute of arc or one part in 3600 of a degree.

3. second (noun) — sense 3

Definition: A short, indeterminate amount of time.

Example: I'll be there in a second.