Definitions from Wiktionary ( )

▸ adjective:  Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.
▸ adjective:  Next to the first in value, power, excellence, dignity, or rank; secondary; subordinate; inferior.
▸ adjective:  Being of the same kind as one that has preceded; another.
▸ adverb:  (with superlative) After the first; at the second rank.
▸ adverb:  After the first occurrence but before the third.
▸ noun:  Something that is number two in a series.
▸ noun:  Something that is next in rank, quality, precedence, position, status, or authority.
▸ noun:  The place that is next below or after first in a race or contest.
▸ noun:  (usually in the plural) A manufactured item that, though still usable, fails to meet quality control standards.
▸ noun:  (usually in the plural) An additional helping of food.
▸ noun:  A chance or attempt to achieve what should have been done the first time, usually indicating success this time around. (See second-guess.)
▸ noun:  (music) The interval between two adjacent notes in a diatonic scale (either or both of them may be raised or lowered from the basic scale via any type of accidental).
▸ noun:  The second gear of an engine.
▸ noun:  (baseball) Second base.
▸ noun:  The agent of a party to an honour dispute whose role was to try to resolve the dispute or to make the necessary arrangements for a duel.
▸ noun:  A Cub Scout appointed to assist the sixer.
▸ noun:  (informal) A second-class honours degree.
▸ verb:  (transitive) To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See etymology 3 for translations.)
▸ verb:  To follow in the next place; to succeed.
▸ verb:  (climbing) To climb after a lead climber.
▸ noun:  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.
▸ noun:  A unit of angle equal to one-sixtieth of a minute of arc or one part in 3600 of a degree.
▸ noun:  (informal) A short, indeterminate amount of time.
▸ verb:  (transitive, UK) To transfer temporarily to alternative employment.
▸ verb:  (transitive) To assist or support; to back.
▸ verb:  (transitive) To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (This may come from etymology 1 above.)
▸ verb:  (transitive, music) To accompany by singing as the second performer.
▸ noun:  One who supports another in a contest or combat, such as a dueller's assistant.
▸ noun:  One who supports or seconds a motion, or the act itself, as required in certain meetings to pass judgement etc.
▸ noun:  (obsolete) Aid; assistance; help.

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