adverb (oftener, oftenest)
Middle English: extended form of oft, probably influenced by selden 'seldom'. Early examples appear to be northern English; the word became general in the 16th century
When pronouncing often, some speakers sound the t, saying /ˈôftən/; for others, it is silent, as in soften, fasten, listen . Either pronunciation is acceptable, although /ˈôfən/ is more common.