Abbreviations used in the KET Vocabulary List are:
abbrev
abbreviation or acronym
mv
modal verb
adj
adjective
n
noun
adv
adverb
phr v
phrasal verb
av
auxiliary verb
pl
plural
Am Eng
American English
prep
preposition
Br Eng
British English
prep phr
prepositional phrase
conj
conjunction
pron
pronoun
det
determiner
sing
singular
exclam
exclamation
v
verb