third
third
UK[θɜːd]US[θɜːrd]
adj
Constituting number three in a sequence; 2nd after the second.
n
One of three equal parts of something.
n
The third in a sequence; the person or thing after the second.
n
(in some musical contexts) an interval spanning three consecutive notes in a diatonic scale.
Etymology
The word 'third' has a direct lineage from the Proto-Indo-European numeral root 'trey-', meaning 'three'. In Proto-Germanic, this developed into 'þridjô', which followed a common pattern for forming ordinal numbers. The Old English form 'þridda' underwent metathesis (a sound switch) to become 'thirdda' and eventually simplified to 'third' in Middle English. This evolution from the cardinal concept of 'three' to the ordinal 'third' illustrates a standard linguistic process for sequencing and ranking, preserving the core numerical identity while adapting its grammatical function.
Analysis
The word 'third' is a simplex form. It is derived from the Old English 'þridda' or 'þirda', which itself evolved from the Proto-Germanic 'þridjô'. Its functional role is as a numeral/adjective/noun.
Examples
She finished in third place in the race.
Cut the cake into thirds so everyone gets an equal share.
He plays third base for the local baseball team.