An epinicion is a triumphal song or ode commemorating a victory at the Olympic Games or in honor of a victor in war. The word comes from Greek epinikion, from neuter of epinikios of victory, from epi- + -nikios (from nikē victory). The epinicion was performed usually by a chorus, or on occasion by a solo singer, as part of the celebration of the victor’s triumphal return to his city. The odes celebrate runners, pentathletes, wrestlers, boxers, and charioteers. It comprised a number of groups of three stanzas each, arranged as strophe, antistrophe, and epode and gave an account of the victor’s success.
Famous poets like Simonides, Pindar, and Bacchylides all composed epinician. Euripedes also wrote one for Alcibiades.
Also read; A short note on periodical Germ, Thoughts towards Nature in Poetry, Literature, and Art