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audible (adj.)

"able to be heard," 1520s, from Middle French audible and directly from Medieval Latin audibilis "that may be heard," from Latin audire "to hear" (from PIE root *au- "to perceive"). Related: Audibly; audibility; audibleness. As a noun, "thing capable of being heard," from 1610s. Football sense of "signal called at the line of scrimmage to change the play called in the huddle" is by 1958.  

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