a cavity or passage in a tubular organ; "the lumen of the intestine"
a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions
a person who has fallen into a decadent state (morally or artistically)
marked by excessive self-indulgence and moral decay; "a decadent life of excessive money and no sense of responsibility"; "a group of effete self-professed intellectuals"
march aggressively into another's territory by military force for the purposes of conquest and occupation; "Hitler invaded Poland on September 1, 1939"
penetrate or assault, in a harmful or injurious way; "The cancer had invaded her lungs"
occupy in large numbers or live on a host; "the Kudzu plant infests much of the South and is spreading to the North"
a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100)
a detailed plan or explanation to guide you in setting standards or determining a course of action; "the president said he had a road map for normalizing relations with Vietnam"