total amount something needed to complete or make perfect a situation in which something happens or exists for a long time without stopping or changing a body; in linguistics: a body of words finding a problem, such as a physical or mental problem very different from each other something that is real the idea that all people are the same a thin, threadlike part of an animal hair or plant tissue; an artificial thread; body cells that form muscles and nerves; a food substance a measure of how steep a road is; in science: the rate of change of something such as temperature or pressure without an end the green part of a tree or plant a system of practices, techniques, procedures, and rules that guide a discipline. in biology: a grouping of tissues into a structure such as a heart or kidney a set of ideas that are used for understanding or explaining something the study of the mind and how it affects behaviour a mass of abnormal cells that develops when cancerous cells divide and grow uncontrollably being useful; a public service such as gas, water, or electricity that is used by everyone the fact that something is not always the same; in statistics: the degree to which scores in a frequency distribution depart from the central value concerning words