I. ˈhwīləm also ˈwī- adverb
Etymology: Middle English, formerly, at times, from Old English hwīlum at times, dative plural of hwīl time, while — more at while
archaic : at a time in the past : formerly , once
II. adjective
Etymology: Middle English, from whilom, adverb
: having been at an earlier time : former
the poor gentleman had grievous treatment at the hands of whilom friends — Agnes Repplier