n A type of twilled woollen cloth, often with a tartan or chequered pattern. (defdate|from 16th c.)
n A length of such material used as a piece of clothing, formerly worn in the Scottish Highlands and other parts of northern Britain and remaining as an item of ceremonial dress worn by members of Scottish pipe bands. (defdate|from 16th c.)
n The typical chequered pattern of a plaid; tartan. (defdate|from 19th c.)
a Having a pattern or colors which resemble a Scottish tartan; checkered or marked with bars or stripes at right angles to one another.