- Of or relating to one of four competitions in a tournament, whose winners go on to play in semifinal competitions.
- A quarterfinal round.
- A quarterfinal match.
- One of the four <xref>competitions</xref> in a <xref>knockout</xref> <xref>tournament</xref> whose <xref>winners</xref> go on to <xref>play</xref> in the two <xref>semifinals</xref>.
- one of the four competitions in an elimination tournament whose winners go on to play in the semifinals