I. noun
1.
a point or part in a surface or solid more or less equidistant from the periphery
the center of the earth
Synonyms: core, middle, midpoint, midst
Related Word: inside, interior
Contrasted words: circumference, compass, perimeter, periphery; bounds, confines, limits
2.
one eminent in or central to a particular activity, condition, or interest
a center of international trade
Synonyms: focal point, focus, heart, hub, nerve center, polestar, seat; compare essence 2
3.
a source or point of origin (as of an influence, pressure, or effect)
the group proved a center of discontent
Synonyms: core, heart, pith, quick, root
Related Word: activator, dynamo, energizer, stimulant
II. adjective
1.
Synonyms: middle 1, centermost, equidistant, halfway, medial, median, mid, middlemost, midmost
2.
Synonyms: middle 2, central, intermediary, intermediate, mean, medial, median, mid