seventh

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The ordinal number matching the number seven in a series.
• noun One of seven equal parts.
• noun Music An interval encompassing seven diatonic degrees.

from The Century Dictionary.

• Last in order of a series of seven; preceded by six of the same kind; next in order after that which is sixth: an ordinal numeral.
• Constituting or being one of seven equal parts into which a whole may be divided: as, the seventh part.
• noun One next in order after the sixth.
• noun The quotient of unity divided by seven; one of seven equal parts into which a whole is divided.
• noun In music:
• noun A tone on the seventh degree above or below a given tone; the next tone to the octave.
• noun The interval between any tone, and a tone on the seventh degree above or below it.
• noun The harmonic combination of two tones at the interval thus defined.
• noun In a scale, the seventh tone from the bottom; the leading-tone: solmizated si, or, in the tonic sol-fa system, ti.
• noun In early English law, a seventh of the rents of the year, or of movables, or both, granted or levied by way of tax.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Next in order after the sixth;; coming after six others.
• adjective Constituting or being one of seven equal parts into which anything is divided.
• adjective the seventh day of the week; Saturday.
• adjective See under Baptist.
• noun One next in order after the sixth; one coming after six others.
• noun The quotient of a unit divided by seven; one of seven equal parts into which anything is divided.
• noun An interval embracing seven diatonic degrees of the scale.
• noun A chord which includes the interval of a seventh whether major, minor, or diminished.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective The ordinal form of the number seven.
• noun The person or thing in the seventh position.
• noun One of seven equal parts of a whole.
• noun music A tone of the seventh degree from a given tone, the interval between two such tones, or the two tones sounding in unison.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the musical interval between one note and another seven notes away from it
• adjective coming next after the sixth and just before the eighth in position
• noun one part in seven equal parts
• noun position seven in a countable series of things