"single" as noun
1 - A 45 RPM vinyl record with one song on side A and one on side B.
2 - A popular song released and sold (on any format) nominally on its own though usually having at least one extra track.
3 - One who is not married or does not have a romantic partner.
"single" as verb
1 - To identify or select one member of a group from the others; generally used with out, either to single out or to single (something) out.
2 - To get a hit that advances the batter exactly one base.
3 - To thin out.
"single" as adjective
1 - Not accompanied by anything else; one in number.
2 - Not divided in parts.
3 - Designed for the use of only one.
