sec·ond

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A unit of time equal to one sixtieth of a minute.
• noun The time needed for a cesium-133 atom to perform 9,192,631,770 complete oscillations.
• noun A brief interval of time; a moment. synonym: moment.
• noun Mathematics A unit of angular measure equal to one sixtieth of a minute.
• adjective Coming next after the first in order, place, rank, time, or quality.
• adjective Repeating an initial instance.
• adjective Reminiscent of one that is well known.
• adjective Alternate; other.
• adjective Inferior to another; subordinate.
• adjective Having a lower pitch.
• adjective Singing or playing a part having a lower range.
• adjective Having the second-highest ratio. Used of gears in a sequence.
• noun The ordinal number matching the number 2 in a series.
• noun One of two equal parts.
• noun One that is next in order, place, time, or quality after the first.
• noun An article of merchandise of inferior quality.
• noun The official attendant of a contestant in a duel or boxing match.
• noun The interval between consecutive tones on the diatonic scale.
• noun A tone separated by this interval from another tone.
• noun A combination of two such tones in notation or in harmony.
• noun The second part, instrument, or voice in a harmonized composition.
• noun An utterance of endorsement, as to a parliamentary motion.
• noun The transmission gear or gear ratio used to produce forward speeds higher than those of first and lower than those of third in a motor vehicle.
• noun Informal A second serving of food.
• noun Baseball Second base.
• transitive verb To endorse (a motion or nomination) as a required preliminary to discussion or vote.
• transitive verb To support or promote.
• transitive verb To attend (a duelist or a boxer) as an aide or assistant.
• transitive verb Chiefly British To transfer (a military officer, for example) temporarily.
• adverb In the second order, place, or rank.
• adverb But for one other; save one.