Unusual plural forms

Common contractions, truncations and initialisms

Interuniversity Style Guide for Writing Institutional Texts in English, del Grup de Treball de Qualitat Lingüística de la Comissió de Llengua de la Xarxa Vives d’Universitat

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