"seventh" in the noun sense
1. seventh
position seven in a countable series of things
2. one-seventh, seventh
one part in seven equal parts
3. seventh
the musical interval between one note and another seven notes away from it
"seventh" in the adjective sense
1. seventh, 7th
coming next after the sixth and just before the eighth in position
Source: WordNet® (An amazing lexical database of English)
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