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arc
1: the apparent path described above and below the horizon by a celestial body (as the sun)2 a: something arched or curved b: a curved path <the arc of a fly ball>3: a sustained luminous discharge of electricity across a gap in a circuit or between electrodes
; also : arc lamp4: a continuous portion (as of a circle or ellipse) of a curved line5: degree measurement on the circumference of a circle —used especially in the phrase of arc<11 minutes 3 seconds of arc>6: a continuous progression or line of development <a story's dramatic arc>
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