position seven in a countable series of things
"She took her seventh turn at bat during the game."
one part in seven equal parts
"The seventh slice of the pie was slightly larger than the others."
the musical interval between one note and another seven notes away from it
"The seventh is a dissonant musical interval that creates tension when played against the tonic note."
The person or thing in the seventh position.
"She finished as the seventh runner across the finish line."
"She is currently in her seventh year living abroad."
The ordinal form of the number seven.
"She finished in seventh place at the competition."
In plain English: Seventh means coming after six things when you count them in order, just like it is your turn to go seventh in line at lunch.
"She is the seventh person to arrive at the meeting today."
Usage: Use "seventh" as an adjective to describe items, people, or events that occupy a specific rank after six others have come before them. It functions grammatically like other ordinals by preceding nouns without requiring additional words such as "of.
Seventh comes from Old English and originally meant "the seventh one." Its modern spelling reflects a later addition of the letter 'n' to match the word seven.