Etymology
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semiquaver (n.)

in musical notation, "sixteenth-note," 1570s, from semi- + quaver (n.). Hence used figuratively for "a very short time; something of very short duration."

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Definitions of semiquaver

semiquaver (n.)
a musical note having the time value of a sixteenth of a whole note;
Synonyms: sixteenth note
From wordnet.princeton.edu