Meaning

noun the limits within which something can be effective

noun an area in which something acts or operates or has power or control:

noun the act of physically reaching or thrusting out

originFrom Middle English rechen, from Old English rǣċan (“to reach”), from Proto-West Germanic *raikijan, from Proto-Germanic *raikijaną, from the Proto-Indo-European *Hreyǵ- (“to bind, reach”). Cognate with Dutch reiken, German reichen.

Etymology from Wiktionary, CC BY-SA 3.0