Meaning

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

noun the limits within which something can be effective

noun a large tract of grassy open land on which livestock can graze

originFrom Middle English rengen, from Old French rengier (“to range, to rank, to order,”), from the noun renc, reng, ranc, rang (“a rank, row”), from Frankish *hring, from Proto-Germanic *hringaz (“ring, circle, curve”). Doublet of ring.

Etymology from Wiktionary, CC BY-SA 3.0