n.
Function: noun
Date: 14th century
1 : one of three equal parts of something <a third of the pie>
2 a ― see NUMBER table b : one that is next after second in rank, position, authority, or precedence <the third in line>
3 a : the musical interval embracing three diatonic degrees b : a tone at this interval specifically : MEDIANT c : the harmonic combination of two tones a third apart
4 plural : merchandise whose quality falls below the manufacturer's standard for seconds
5 : THIRD BASE
6 : the third forward gear or speed especially of a motor vehicle