Medical Definition of TISSUE. : an aggregate of cells usually of a particular kind together with their intercellular substance that form one of the structural materials of a plant or an animal and that in animals include connective tissue, epithelium, muscle tissue, and nerve tissue.ull Definition of TISSUE. 1. a: a fine lightweight often sheer fabric. 2. : a piece of soft absorbent tissue paper used especially as a handkerchief or for removing cosmetics.
In mathematics, the adjective constant means non-varying. The noun constant may have two different meanings. It may refer to a fixed and well defined number or other mathematical object. The term mathematical constant (and also physical constant) is sometimes used to distinguish this meaning from the other one. A constant may also refer to a constant function or its value (it is a common usage to identify them).
In the expression 3 x + 7, 7 is a constant. A number that is in a term all by itself. In the expression y = 2 x â 16, 16 is a constant. A term that is just a number, not multiplied by a variable or anything else. It's just along for the ride.