1constituting number three in a sequence; 3rd:the third centurythe third of OctoberEdward the Third
the third finisher or position in a race or competition:Hill finished third
the third in a sequence of a vehicle’s gears:he took the corner in third
Baseball third base.
chiefly British the third form of a school or college.
thirdly (used to introduce a third point or reason):second, they are lightly regulated; and third, they do business with non-resident clients
British a place in the third grade in an examination, especially that for a degree.
2each of three equal parts into which something is or may be divided:a third of a mile
3 Music an interval spanning three consecutive notes in a diatonic scale, e.g. C to E ( major third, equal to two tones) or A to C ( minor third, equal to a tone and a semitone).
the note which is higher by a third than the tonic of a diatonic scale or root of a chord.
third time lucky (or USthird time is the charm)
used to express the hope that, after twice failing to accomplish something, one may succeed in the third attempt.
