triple (adj.)

early 15c., from Old French triple or directly from Latin triplus "threefold, triple," from tri- "three" (see tri-) + -plus "-fold" (see -plus). As a noun, early 15c., "a triple sum or quantity," from the adjective. The baseball sense of "a three-base hit" is attested from 1880. Related: Triply (adv.). Triple-decker is from 1940 of sandwiches and wedding cakes, 1942 of beds.

triple (v.)

late 14c., from Medieval Latin triplare "to triple," from Latin triplus "threefold, triple" (see triple (adj.)). Related: Tripled; tripling.