Latin words used in English:

affidavit

agenda

alias

alibi

aquarium

arbiter

area

bona fide

census

circus

complex

consensus

curriculum

data

deficit

decorum

delirium

exit

genius

honorarium

inertia

insomnia

lens

lingua franca

meridian (medius dies)

media

millennium

millepede

mediterranean

interim

interregnum

maximum

medium

mininum

omnibus

pendulum

peninsula

premium

propaganda

rabies

radius

referendum

species

series

specimen

ultimatum

via

equinox: vernal equinox (20/21 March), autumnal equinox (22/23 September)

solstice: summer solstice (21 June), winter solstice (22 December)

bissextile year (leap year)

ante diem sextus kalendas Martii (Kalendas, Idibus, Nonis)