The etymology of etymology:
etumon - the Greek for 'true sense',
logia - the Greek for 'study'.
etumon itself derives from 'etumos' - meaning real or true.
logia is derived from the Ancient Greek word 'lego', meaning 'speak, pick, or tell'. Wikipedia notes that the word 'lecture' is thus defined.
Derivations and all derivatives of make me happy. In both Mathematical and Anglican forms.