1. (

• opener

) the first event in a series; "she played Chopin for her opener"; "the season's opener was a game against the Yankees" ;

2. (

• undoer ,
• opener ,
• unfastener ,
• untier

) a person who unfastens or unwraps or opens; "children are talented undoers of their shoelaces" ;

3. (

• opener

) a hand tool used for opening sealed containers (bottles or cans) ;