For a long time without essential change.

synonym: permanently.

Roget 141: in statu quo [Lat.]; for good, finally; at a stand, at a standstill; uti possidetis [Lat.]; without a shadow of turning.   

Roget 110: long; for a long time, for an age, for ages, for ever so long, for many a long day; long ago etc. (in a past time) 122; longo intervallo [It].    all the day long, all the year round; the livelong day, as the day is long, morning noon and night; hour after hour, day after day, &c.; for good; permanently etc. adj.. ... show more

Roget 106: 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 [Lat.]; de die in diem [Lat.]; from day to day, from hour to hour &c.; 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 etc. (completely) 52; for good etc. (diuturnity) 110.    hereupon, thereupon, whereupon; then; anno Domini, A.   D.; ante Christum, A.   C.; before Christ, B.   C.; anno urbis conditae [Lat.], A.   U.C.; anno regni [Lat.], A.   R.; once upon a time, one fine morning, one fine day, one day, once.    ... show more