quarterfinal

As a noun quarterfinal

is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As a noun quarterfinal

is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between quarterfinal and null

is that quarterfinal is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals while null is zero, nil; the cardinal number before einn.

As nouns the difference between playoff and quarterfinal

is that playoff is a final game in a series needed to break a tie while quarterfinal is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals.

As nouns the difference between quarterfinal and quartet

is that quarterfinal is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals while quartet is (music) a music composition in four parts, each performed by a single voice or instrument.

As nouns the difference between taxonomy and quarterfinal

is that taxonomy is the science or the technique used to make a classification while quarterfinal is one of the four competitions in a knockout tournament whose winners go on to play in the two semifinals.