Seventh

adjective
1.
next after the sixth; being the ordinal number for seven.
2.
being one of seven equal parts.
noun
3.
a seventh part, especially of one (1/7).
4.
the seventh member of a series.
5.
Music.

a tone on the seventh degree from a given tone (counted as the first).
the interval between such tones.
the harmonic combination of such tones.

adjective
1.
(usually prenominal)

coming after the sixth and before the eighth in numbering or counting order, position, time, etc; being the ordinal number of seven: often written 7th
(as noun): she left on the seventh, he was the seventh to arrive

noun
2.

one of seven equal or nearly equal parts of an object, quantity, measurement, etc
(as modifier): a seventh part

3.
the fraction equal to one divided by seven (1/7)
4.
(music)

the interval between one note and another seven notes away from it counting inclusively along the diatonic scale
one of two notes constituting such an interval in relation to the other See also major (sense 14), minor (sense 4), interval (sense 5)
short for seventh chord

adverb
5.
Also seventhly. after the sixth person, position, event, etc
sentence connector
6.
Also seventhly. as the seventh point: linking what follows to the previous statements, as in a speech or argument