i Register
In some senses, previously is marked as archaic. Watch for register when choosing this word.
adv
First; beforehand, in advance.
I must, however, previously remark, that the power of generalizing ideas, to any great extent, is not very common amongst men or women.
At an earlier time; already.
The discovery of a previously unknown species had taken place nearly two years previously.
Pliny the Elder, the Roman encyclopedist, declares that to urinate in a spot where a dog has previously done so results in loss of virility.
Recapitulating the preceding episodes of a series.