One who, or that which, opens.
- One that opens, especially a device used to cut open cans or pry up bottle caps.
- Games The player who starts the betting in cards.
- Games Cards of sufficient value to enable the holder to open the betting.
- The first act in a theatrical variety show.
- Sports The first game in a series.
- for openers Informal To begin with: "Out of 54 potential jurors, they knocked 20 off . . . just for openers” ( Joseph DiMona).