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only one

ADJECTIVE
sole
Synonyms
STRONGEST
exclusive lone one and only remaining
STRONG
ace individual one particular separate single solitary solo
WEAK
onliest only unique unshared
Antonyms
STRONG
combined common general mixed ordinary together united
WEAK
shared

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.