Plural of fourteenth; fractions or ordinal positions representing 1/14 of something divided into 14 equal parts.
From 'fourteenth' (ordinal adjective from 'fourteen') with plural '-s' ending. The ordinal comes from Old English 'feowertiene' plus '-th' ordinal suffix.
In music, a fourteenth interval (skipping up two octaves) is called a 'double seventh' and creates a strangely bright, open sound that composers rarely use because it's so unusual.
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