adverb
Chiefly in later use At one time, formerly.
Frequently introducing an earlier name or style placed parenthetically after the current term.
Origin
Mid 17th century. From classical Latin ōlim once, at one time, formerly from a first element also seen in olle that man, he (archaic form of ille), ultrā + -im, suffix forming adverbs.
Are You Learning English? Here Are Our Top English Tips