Definitions:
a spiritual being believed to act as an attendant, agent, or messenger of god, conventionally represented in human form with wings and a long robe

a person of exemplary conduct or virtue

a person who supports a business financially, typically one who invests private capital in a small or newly established enterprise

a former english coin minted between the reigns of edward iv and charles i and bearing the figure of the archangel michael killing a dragon.

an aircraft's altitude (often used with a numeral indicating thousands of feet)

an unexplained radar echo.