- past participle
- present participle
second, sec, s (noun)
1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites
moment, mo, minute, second, bit (noun)
an indefinitely short time
"wait just a moment"; "in a mo"; "it only takes a minute"; "in just a bit"
second base, second (noun)
the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield
moment, minute, second, instant (noun)
a particular point in time
"the moment he arrived the party began"
following the first in an ordering or series
"he came in a close second"
second, arcsecond (noun)
a 60th part of a minute of arc
"the treasure is 2 minutes and 45 seconds south of here"
the official attendant of a contestant in a duel or boxing match
second, secondment, endorsement, indorsement (noun)
a speech seconding a motion
"do I hear a second?"
second gear, second (noun)
the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle
"he had to shift down into second to make the hill"
irregular, second (adj)
merchandise that has imperfections; usually sold at a reduced price without the brand name
second, 2nd, 2d (adj)
coming next after the first in position in space or time or degree or magnitude
a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first
"second flute"; "the second violins"
second, back, endorse, indorse (verb)
give support or one's approval to
"I'll second that motion"; "I can't back this plan"; "endorse a new project"
transfer an employee to a different, temporary assignment
"The officer was seconded for duty overseas"
second, secondly (adverb)
in the second place
"second, we must consider the economy"
The second is the base unit of time in the International System of Units and is also a unit of time in other systems of measurement it is the second division of the hour by sixty, the first division by 60 being the minute. Between 1000 and 1960 the second was defined as 1/86,400 of a mean solar day. Between 1960 and 1967, it was defined in terms of the period of the Earth's orbit around the Sun in 1900, but it is now defined more precisely in atomic terms. Seconds may be measured using mechanical, electric or atomic clocks. Astronomical observations of the 19th and 20th centuries revealed that the mean solar day is slowly but measurably lengthening and the length of a tropical year is not entirely predictable either; thus the sun–earth motion is no longer considered a suitable basis for definition. With the advent of atomic clocks, it became feasible to define the second based on fundamental properties of nature. Since 1967, the second has been defined to be: SI prefixes are frequently combined with the word second to denote subdivisions of the second, e.g., the millisecond, the microsecond, and the nanosecond. Though SI prefixes may also be used to form multiples of the second such as kilosecond, such units are rarely used in practice. The more common larger non-SI units of time are not formed by powers of ten; instead, the second is multiplied by 60 to form a minute, which is multiplied by 60 to form an hour, which is multiplied by 24 to form a day.