
1) Being one of 15 equal parts 2) Crystal anniversary 3) Ides of March date 4) Next after the fourteenth 5) Ordinal
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In music, a fifteenth or double octave, abbreviated 15ma, is the interval between one musical note and another with one-quarter the wavelength or quadruple the frequency. The fourth harmonic, it is two octaves. It is referred to as a fifteenth because, in the diatonic scale, there are 15 notes between them if one counts both ends (as is customary)...
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http://en.wikipedia.org/wiki/Fifteenth

• (a.) Next in order after the fourteenth; -- the ordinal of fifteen. • (a.) Consisting of one of fifteen equal parts or divisions of a thing. • (n.) A species of tax upon personal property formerly laid on towns, boroughs, etc., in England, being one fifteenth part of what the personal property in each town, etc., had been valued at...
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1. Next in order after the fourteenth; the ordinal of fifteen. ... 2. Consisting of one of fifteen equal parts or divisions of a thing. ... Origin: OE. Fiftenthe; cf. Fiftethe, AS. Fiftea. See Fifteen. ... 1. One of fifteen equal parts or divisions; the quotient of a unit divided by fifteen. ... 2. A species of tax upon personal property formerly l...
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http://www.encyclo.co.uk/local/20973
Fif'teenth` adjective [ Middle English
fiftenthe ; confer
fiftethe , Anglo-Saxon
fīfteōða . See
Fifteen .]
1. Next in order after the fourteenth; -- the ordinal of fifteen.
2. Consisting of one of fifteen equal parts or divisions of a thing. ...
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http://www.encyclo.co.uk/webster/F/26

In music, a fifteenth is a stop in an organ tuned two octaves above the diaposon. In music a fifteenth is an interval consisting of two octaves.
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http://www.probertencyclopaedia.com/browse/VF.HTM

tax of one fifteenth of annual income
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http://www.tudorrevels.co.uk/glossary.php

[
adj] - coming next after the fourteenth and just before the sixteenth in position 2. [n] - position 15 in a countable series of things
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http://www.webdictionary.co.uk/definition.php?query=fifteenth
15th adjective coming next after the fourteenth and just before the sixteenth in position
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https://www.encyclo.co.uk/local/20974

next after the fourteenth; being the ordinal number for 15. · being one of 15 equal parts.
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https://www.infoplease.com/dictionary/fifteenth
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