Why is the ninth month called September?
mid-15c., "performed, carried out;" 1640s, "of the branch of government that carries out the laws," from Middle French executif, from Latin executivus, from past participle stem of exequi (see execution). The noun in this sense is from 1776, as a branch of government. Meaning "businessman" is 1902 in American English. Executive privilege is attested by 1805, American English.
Stylish; luxurious; costly; posh: executive housing/ executive bus/ executive class (1970s+)