Plurals of most frequent words of foreign origin

addendum

addenda

agendum

agendums, agenda, agendas

alumna (fem.)

alumnae (fem.) (uh-LUM-nee, uh-LUHM-nee)

alumnus (masc.)

alumni (masc.) (uh-LUM-nei, uh-LUHM-nei)

apparatus

apparatus or apparatuses

appendix

appendices (books), appendixes (anatomy)

bacillus

bacilli

bacterium

bacteria

bureau

bureaux

chateau

chateaus, chateaux

cherub

cherubs, cherubim, cherubims

concerto

concertos, concerti

consortium

consortia

corrigendum

corrigenda

crisis

crises (KREI-seez)

criterion

criteria

curriculum

curricula

data, datum

data

focus

focuses, focal points, foci (mathematics, science)

formula

formulas (politics) formulae (science)

forum

fora or forums

genus

genera

graffito, graffiti

graffiti, graffitis

index

indexes (books), indices (science, economics)

kudos, kudo

kudos (koo-doz)

maximum

maximums or maxima

medium

media, mediums (spiritualism)

memorandum

memoranda

papyrus

papyri or papyruses

phenomenon

phenomena

premium

premiums

referendum

referenda or referendums

seraph

seraphs, seraphim

soprano

sopranos, soprani

sou

sous (SOOZ), sous (SOO)

spectrum

spectra (science), spectrums (politics)

stigma

stigmata, stigmas

symposium

symposia or symposiums