consummate

Concise Oxford English Dictionary © 2008 Oxford University Press:
consummate

▶verb /ˈkɒnsjʊmeɪt, -sə-/ 

• 1 make (a marriage or relationship) complete by having sexual intercourse.

• 2 complete (a transaction).

▶adjective /kənˈsʌmət, ˈkɒnsʌmət/ showing great skill and flair.

– derivatives
consummately adverb,
consummation noun,
consummator noun.

– origin ME: from L. consummat-, consummare ‘bring to completion’, from con- ‘altogether’ + summa ‘sum total’, fem. of summus ‘highest, supreme’.