Is it ensure, insure, or assure?
1540s, from Middle French capture "a taking," from Latin captura "a taking" (especially of animals), from captus (see captive).
1795, from capture (n.); in chess, checkers, etc., 1820. Related: Captured; capturing. Earlier verb in this sense was captive (early 15c.).
capture cap·ture (kāp'chər)n. The act of catching, taking, or holding a particle or impulse.