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).
it means that there are two numbers that are not constant. the value of each number is always related to the other based on an internal function/formual. those two vairables are usually related through a 3rd constant. For example, look at surface of a rectangle that is 100 square meters.