the period of actual darkness after sunset and before sunrise; a night.

a building where a person or family normally lives; a house.

free from dirt, contamination, impurities, etc.; clean.

clearly and easily seen.

the quality of being clear; clarity.

cleaning; purifying.

freeing from guilt, sin or ceremonial uncleaness.

a debt; a loan.

(math.) the mathematical process of finding the difference between two numbers or quantities; subtraction.