Three incidents or achievements that occur together.
Three achievements in a single game, or similar, such as three consecutive wins.
Striking out three times in one game.
Three wickets taken by a bowler in three consecutive balls.
A means of securing a seat in the House of Commons by placing one's hat upon it.
Three goals scored by one player in a game, in ice hockey usually followed by fans throwing their hats onto the rink.
Any magic trick performed with a hat.
Anything folded into thirds to resemble a trifold.
Any sheet of paper or cardboard, folded into three sections along two parallel creases and used to present information, typically as a brochure or display board.
A wallet with three equal-sized sections that fold together.
threefold
Of a mirror: having three reflective surfaces hinged together.