Singular Plural
addendum addenda
agenda agendas
alumnus, alumna alumni
appendix appendices
basis bases
bureau bureaus
campus campuses
consortium consortia
corps corps
criterion criteria
formula formulas
index indexes (books), indices (science, economics)
maximum maximums
medium mediums (life sciences, art), media (press, IT)
memorandum memoranda
millennium millennia
phenomenon phenomena
plus pluses
practicum practicums
premium premiums
quantum quanta
referendum referendums
stimulus stimuli
thesis theses

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