Adjective

1. not accompanied by anything else
2. :"You can't give me a single reason as to why I shouldn't shoot your ****ing head off!" the criminal yelled to the store clerk.
3. not divided in parts
4. designed for the use of only one
5. not married
6. :Josh put down that he was a single male on the dating website.

Noun

1. a 45rpm 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 has at least one extra track
3. one who is not married
4. :He went to the party, hoping to meet some friendly singles there.
5. a score of one run
6. a hit in baseball where the batter advances to first base

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. : Eddie singled out his favorite marble from the bag.
3. : Evonne always wondered why Ernest had singled her out of the group of giggling girls she hung around with.
4. to get a hit that advances the batter exactly one base
5. : Pedro singled in the bottom of the eighth inning, which, if converted to a run, would put the team back into contention.