Half-heard a. : Imperfectly or partly heard to the end.

Example:
Math Problem: Statistics: What was the Average number of minutes of the talk heard by the students in audience?

Taxonomy
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Defination from the web:
heard the words, or possibly half-heard them while on the run with a deadline yapping in his tracks. ... Most only half-heard what I said because they were interested in the fight coming up. THE MEDIA; HBO'S MERCHANT CAUGHT IN MIDDLE : WHAT SMOKES by Daily News ...