at any (single) time
always, at any time
Cases of word usage
1) a medicine which medieval scientists thought keeps a person alive for ever (elixir)
2) without beginning or end; lasting for ever (eternal)
3) going on for ever (everlasting)
4) for ever (evermore)
5) an instance of leaving out part of the middle of a word, as in e'er = ever (syncope)