Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.

(with superlative) After the first; at the second rank. / After the first occurrence but before the third.

Something that is number two in a series. / Something that is next in rank, quality, precedence, position, status, or authority. / The place that is next below or after first in a race or contest.

(transitive) To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under #Etymology 3 for translations.) / To follow in the next place; to succeed.

One-sixtieth of a minute; the SI unit of time, defined 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.

(transitive, UK) To transfer temporarily to alternative employment. / (transitive) To assist or support; to back.

One who supports another in a contest or combat, such as a dueller's assistant. / One who supports or seconds a motion, or the act itself, as required in certain meetings to pass judgement etc.

(countable) A piece of knowledge that is hidden and intended to be kept hidden. / The key or principle by which something is made clear; the knack. / Something not understood or known.

Being or kept hidden. / (obsolete) Withdrawn from general intercourse or notice; in retirement or secrecy; secluded.

(transitive) To make or keep secret. / (transitive) To hide secretly.