Some 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)