Liddell-Scott-Jones

μάθημα (mathēma) a lesson ^G:N-N

μάθημα-ημα, ατος, τό,

(μαθεῖν) that which is learnt, lesson, τὰ παθήματα μαθήματα [Refs 5th c.BC+]; μ. τινός or περί τι, [Refs 5th c.BC+]; ἀφεῖσθαι τοὺς παῖδας ἀπὸ τῶν μ. [Refs 3rd c.BC+]

__2 learning, knowledge, [Refs 5th c.BC+]; οἱ καθιστάμενοι ἐπὶ τῶν μ. educational authorities, [Refs 2nd c.BC+]; τὸ μ. τὸ περὶ τὰς τάξεις the science of tactics, [Refs 5th c.BC+]
__3 especially the mathematical sciences, [Refs 4th c.BC+]; τρία μ., i. e. arithmetic, geometry, and astronomy, accusative to [Refs 5th c.BC+]; later τὰ τέσσαρα μ. (ἁρμονική being added) [Refs 4th c.BC+] distinguished pure from mixed μ., τὰ φυσικώτερα τῶν μ., οἷον ὀπτικὴ καὶ ἁρμονικὴ καὶ ἀστρονομία [Refs]; οἱ ἀπὸ τῶν μ. mathematicians, [Refs 2nd c.AD+]
__4 astrology, [Refs 6th c.AD+]
__5 creed, [Refs 4th c.AD+]