Meanwhile

• POS: Noun, Adverb
• HYPHEN: mean=while

CIDE DICTIONARY

Meanwhile, n. 

 The intervening time; as, in the meantime (or mean time).  [1913 Webster]

Meanwhile, adv. 

 In the intervening time; during the interval.  [1913 Webster]

OXFORD DICTIONARY

Meanwhile, adv. & n.
--adv.
1 in the intervening period of time.
2 at the same time.
--n. the intervening period (esp. in the meanwhile).

Etymology

MEAN(3) + WHILE

THESAURUS

Meanwhile

ad interim, at a stretch, between acts, betweentimes, betweenwhiles, during the interval, during the time, en attendant, for a time, for the meantime, for the moment, for the nonce, in the interim, in the meanwhile, interim, interval, meantime, pendente lite, temporarily, the while, until then, while

ROGET THESAURUS

Meanwhile

Time

N time, duration, period, term, stage, space, span, spell, season, the whole time, the whole period, space-time, course, snap, intermediate time, while, interim, interval, pendency, intervention, intermission, intermittence, interregnum, interlude, respite, era, epoch, time of life, age, year, date, decade, moment, glass of time, sands of time, march of time, Father Time, ravages of time, arrow of time, river of time, whirligig of time, noiseless foot of time, scythe, continuing, on foot, permanent, while, whilst, during, pending, during the time, during the interval, in the course of, at that point, at that point in time, for the time being, day by day, in the time of, when, meantime, meanwhile, in the meantime, in the interim, ad interim, pendente lite, de die in diem, from day to day, from hour to hour, hourly, always, for a time, for a season, till, until, up to, yet, as far as, by that time, so far, hereunto, heretofore, prior to this, up to this point, the whole time, all the time, all along, throughout, for good, hereupon, thereupon, whereupon, then, anno Domini, A, D, ante Christum, A, C, before Christ, B, C, anno urbis conditae, A, U, C, anno regni, A, R, once upon a time, one fine morning, one fine day, one day, once, time flies, tempus fugit, time runs out, time runs against, race against time, racing the clock, time marches on, time is of the essence, time and tide wait for no man, ad calendas Groecas, panting Time toileth after him in vain, 'gainst the tooth of time and razure of oblivion, rich with the spoils of time, tempus edax rerum, the long hours come and go, the time is out of joint, Time rolls his ceaseless course, Time the foe of man's dominion, time wasted is existence, used is life, truditur dies die, volat hora per orbem, carpe diem.

Synchronism

N synchronism, coexistence, coincidence, simultaneousness, simultaneity, concurrence, concomitance, unity of time, interim, isochronism, contemporary, coetanian, synchronous, synchronal, synchronic, synchronical, synchronistical, simultaneous, coexisting, coincident, concomitant, concurrent, coeval, coevous, contemporary, contemporaneous, coetaneous, coeternal, isochronous, at the same time, simultaneously, together, in concert, during the same time, in the same breath, pari passu, in the interim, as one, at the very moment, just as, as soon as, meanwhile.