Third

Third or 3rd may refer to:

Numbers

3rd, the ordinal form of the cardinal number 3
1⁄3, a fraction of one third
¹⁄₆₀ of a second, i.e., the third in a series of fractional parts in a sexagesimal number system

3rd meridian east, a line of longitude extending through Europe and Africa
3rd meridian west, a line of longitude extending through Europe and Africa
3rd parallel north, a circle of latitude above the Equator
3rd parallel south, a circle of latitude below the Equator
3rd Street (disambiguation)
Third Avenue (disambiguation)
Highway 3
Third Beach, located at Ferguson Point in Stanley Park in Vancouver, British Columbia
Third Brook, flows into West Brook by Walton, New York

Interval number of three in a musical interval
- Major third, a third spanning four semitones
- Minor third, a third encompassing three half steps, or semitones
- Neutral third, wider than a minor third but narrower than a major third
- Augmented third, an interval of five semitones
- Diminished third, produced by narrowing a minor third by a chromatic semitone
Third (chord), chord member a third above the root
Degree (music), three away from tonic
- Mediant, third degree of the diatonic scale
- Submediant, sixth degree of the diatonic scale – three steps below the tonic
- Chromatic mediant, chromatic relationship by thirds
Ladder of thirds, similar to the circle of fifths