masculine nominative singular with -ti enclitic particle (= maggo + iti)
Analysis. maggo (magga in nominative singular, with -o ending) + iti (enclitic 'thus, so'); magga functions here as the subject, iti marks it as a quotation or naming particle, 'the path thus' or 'path (as it is called)'.
Etymology. Root √marg- (Sanskrit mārga) meaning 'to go, track, trail'; cognate with English 'march' (from Latin marcāre, walking). The noun magga is the agent noun 'that which is trodden' or 'a way made by going'; the sense of 'path' is the concrete ground-image underlying the Buddhist metaphorical uses (path of practice, the Eightfold Path as magga).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version