(chiefly poetic, dialectal, and in combination) often; frequently; not rarely
An oft-told tale
1819, George Gordon Byron, John Galt (biography), The Pophecy of Dante, Canto the Fourth, 1857, The Complete Works of Lord Byron, Volume 1, page 403,
And how is it that they, the sons of fame,
Whose inspiration seems to them to shine
From high, they whom the nations oftest name,
Must pass their days in penury or pain,
Or step to grandeur through the paths of shame,
And wear a deeper brand and gaudier chain?
1902, James H. Mulligan, In Kentucky, quoted in 2005, Wade Hall (editor), The Kentucky Anthology, page 203,
The moonlight falls the softest
In Kentucky;
The summer days come oftest
In Kentucky;