A quarter, one of four equal parts of a whole.
The fourth gear of an engine.
A musical interval which spans four degrees of the diatonic scale, for example C to F (C D E F).
The person or thing in the fourth position.
The ordinal form of the number four.
To agree with a proposition or statement after it has already been thirded.
A sequence of four elements.
One of a group of four, particularly one of four babies born from the same mother during the same birth.
A tuplet of four notes.
A cycle for carrying four riders, arranged so that all the riders can assist in the propulsion.