Definitions from Wiktionary ( )

▸ adjective:  Not accompanied by anything else; one in number.
▸ adjective:  Not divided in parts.
▸ adjective:  Designed for the use of only one.
▸ adjective:  Performed by one person, or one on each side.
▸ adjective:  Not married, and (in modern times) not dating or without a significant other.
▸ adjective:  (botany) Having only one rank or row of petals.
▸ adjective:  (obsolete) Simple and honest; sincere, without deceit.
▸ adjective:  Uncompounded; pure; unmixed.
▸ adjective:  (obsolete) Simple; foolish; weak; silly.
▸ noun:  (music) A 45 RPM vinyl record with one song on side A and one on side B.
▸ noun:  (music) A popular song released and sold (on any format) nominally on its own though usually having at least one extra track.
▸ noun:  One who is not married or does not have a romantic partner.
▸ noun:  (cricket) A score of one run.
▸ noun:  (baseball) A hit in baseball where the batter advances to first base.
▸ noun:  (dominoes) A tile that has a different value (i.e. number of pips) at each end.
▸ noun:  (US, informal) A bill valued at $1.
▸ noun:  (UK) A one-way ticket.
▸ noun:  (Canadian football) A score of one point, awarded when a kicked ball is dead within the non-kicking team's end zone or has exited that end zone.
▸ noun:  (tennis, chiefly in the plural) A game with one player on each side, as in tennis.
▸ noun:  One of the reeled filaments of silk, twisted without doubling to give them firmness.
▸ noun:  (UK, Scotland, dialect) A handful of gleaned grain.
▸ noun:  (computing, programming) A floating-point number having half the precision of a double-precision value.
▸ noun:  (film) A shot of only one character.
▸ noun:  A single cigarette.
▸ noun:  (rail transport, obsolete) Synonym of single-driver.
▸ verb:  (baseball) To get a hit that advances the batter exactly one base.
▸ verb:  (agriculture) To thin out.
▸ verb:  (of a horse) To take the irregular gait called singlefoot.
▸ verb:  (intransitive, archaic) To sequester; to withdraw; to retire.
▸ verb:  (intransitive, archaic) To take alone, or one by one; to single out.
▸ verb:  (transitive) To reduce (a railway) to single track.
▸ noun:  A surname from Old English.

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