: the time before something happens or before a specified period ends
The new computers won't arrive until next week, but we can continue to use the old ones in the meantime.
: meanwhile entry 2
meantime he had been attentive to his other interests—H. R. Warfel
: time that is based on the motion of the theoretical mean sun
To find local mean time, determine how many degrees of longitude you are from your time-zone standard. (Find your longitude on a map.) Multiply this number by four to get your correction in minutes. If you are east of the standard longitude your correction is a positive number; if you are west it is negative. Apply the correction to standard time to get your local mean time.—Sky & Telescope
called also mean solar time
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Merriam-Webster unabridged
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