adjective

1. perfectly clean; without a spot or stain; unsoiled
2. perfectly correct; without a flaw, fault, or error
3. pure; innocent; without sin
4. Biol. of a solid color, without marks or spots

Etymology: ME < L immaculatus < in-, not + maculatus, pp. of maculare, to spot, soil < macula, a spot, prob. < IE base *smē-, to smear > smite