meantime
Multiple Entries:
meantime mean time
Concise Oxford English Dictionary © 2008 Oxford University Press:
meantime/ˈmiːntʌɪm/
▶adverb (also in the meantime) meanwhile.
Concise Oxford English Dictionary © 2008 Oxford University Press:
mean time
▶noun Astronomy another term for mean solar time.
'meantime' also found in these Oxford entries:

