Of or pertaining to the inhabitants of Scotland, their country, or their language; as, Scottish industry or economy; a Scottish chief; a Scottish dialect.

An adjective describing things pertaining to Scotland, e.g. Scottish descent, Scottish heritage.

the dialect of English used in Scotland

of or relating to or characteristic of Scotland or its people or culture or its English dialect or Gaelic language; "Scots gaelic"; "the Scots community in New York"; "`Scottish' tends to be the more formal term as in `The Scottish Symphony' or `Scottish authors' or `Scottish mountains'"; "`Scotch' is in disfavor with Scottish people and is used primarily outside Scotland except in such frozen phrases as `Scotch broth' or `Scotch whiskey' or `Scotch plaid'"