History
History
Synonyms
UK
US
Meaning:
refinement

the state of being well-mannered, cultured etc; a small improvement (to writing etc)

cleansing

vacuum

a space completely empty of substance or gas(es); a space in a container from which (almost all) the air has been pumped out; to use a vacuum cleaner to clean (a carpet etc)

emptiness

RAREFACTION as in Wiktionary
RAREFACTION as in Wikipedia