The ordinal form of seven, indicating position in a sequence or a fraction representing one part of seven equal parts.
From Old English seofoþa, derived from seofon (seven) plus the ordinal suffix -þa. Related to Proto-Germanic sebuntho and ultimately to Proto-Indo-European septm̥tos, sharing roots with Latin septimus.
In music, the seventh note of a scale creates a sense of tension that 'wants' to resolve to the octave, making seventh chords essential to jazz and blues - this mathematical relationship between frequency ratios creates emotional responses we feel instinctively.
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