whi·lom 
(wīləm, hwī-)
(wīləm, hwī-)adj.
Having once been; former: the whilom editor in chief.
adv.
Archaic
Archaic
At a past time; formerly.
[Middle English, at times, from Old English hwīlum, dative pl. of hwīl, time, while; see kweiə- in the Appendix of Indo-European roots.]