The adverb erstwhile has been part of English since the 16th century, but it is formed from two words that are much older. It comes from the Old English words ær, meaning "early," and hwīl, which has much the same meaning as the modern word while. (The English word ere, meaning "before," is also descendant of ær.) The adjective erstwhile, as in erstwhile enemies, joined the language around 1900.
Examples of erstwhile in a Sentence
Adverb
there's now a store where erstwhile lay green and pleasant pastures
Adjective
my erstwhile friend ignored me when I ran into her at the mall
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'erstwhile.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.