symposium
Pronunciation: /sɪmˈpəʊzɪəm/
noun ( plural symposia /-zɪə/ or symposiums)

Origin:
late 16th century (denoting a drinking party): via Latin from Greek sumposion, from sumpotēs 'fellow drinker', from sun- 'together' + potēs 'drinker'

Spelling help
The plural of symposium can be spelled either symposia (as in Latin) or symposiums.