In a line or queue one person wide.

Alone; without assistance; by oneself.

A liquor made only from the malted barley of a single distillery, unblended with other liquors. / Short for single malt whisky, or single malt scotch.

A material formed from by the growth of a crystal nucleus without secondary nucleation or impingement on other crystals; a regular three-dimensional structure extends throughout the material

Without help from others; unassisted. / Using only one hand. / Designed for only one hand.

In a single-handed manner.

simple past tense and past participle of single-hand

To type (or format) text without leaving a blank line between each line of text. / To type (or format) text with only one space between consecutive sentences.

(transitive) To select one from a group and treat differently.

(of an organism) Consisting of one cell; unicellular.