Epistemology
The word "epistemology" is derived from the ancient Greek "epistēmē" meaning "knowledge" and the suffix "-logy", meaning "logical discourse" (derived from the Greek word "logos" meaning "discourse"). It is analogue to the German "Wissenschaftslehre" (literally, theory of science) which was introduced by philosophers Johann Fichte and Bernard Bolzano in the late 18th century. The word first appeared in English in 1847 as a translation of the German in New York's "Eclectic Magazine" review of a philosophical novel by German author Jean Paul:
Gimmick
The origin of the term, "gimmick", is uncertain. Etymologists suggest that the term emerged in the United States in the early twentieth century. The "Oxford Dictionary" suggests that it may have originally been a slang term for something that a con artist or magician manipulated to make appearances different from reality and gradually changed its meaning to refer to any ‘piece of magicians' apparatus’. The word itself may be an approximate anagram of the word magic. Another possible origin is that it may have come into use among the gaming tables, where it came to refer to "a device used for making a fair game crooked". The term first appeared in American newspapers in the 1910s and 1920s.