Real Dictionary

enclitic in American English
dependent on the preceding word for its stress
adjective: closely connected in pronunciation with the preceding word and not having an independent accent or phonological status
noun: an enclitic word, as Latin que “and” in arma virumque, “ arms and the man”

enclitic in British English
adjective: denoting or relating to a monosyllabic word or form that is treated as a suffix of the preceding word, as Latin -que in populusque