ad. First of all, before (some other specified thing).
ad. Sooner (than); before.
ad. Formerly, once, erstwhile.
the GNU version of the Collaborative International Dictionary of English
ad. First.
ad. Previously; before; formerly; heretofore.
The Century Dictionary and Cyclopedia
First; at first; at the beginning.
Once; formerly; long ago.
Before; till then or now; hitherto.
At length, at present: especially with now (now at erst).
First.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
ad. at a previous time
Word Usage
"The choice of phrases in Ballads and Songs, and perhaps more in serious pieces, is of much importance; a common use of old worn out words I do not like, such as erst, whilom, and a thousand more; and yet to take up and use"