Early 19th century; earliest use found in John Neal (1793–1876), author and women's rights activist. From more pron.adverbn.3preposition + 'n.
Definition of more'n in US English:
more'n
(also morn, mor'n)
nounˈmɔːrən
US informal
More than (in various syntactic contexts).
Origin
Early 19th century; earliest use found in John Neal (1793–1876), author and women's rights activist. From more [pronoun, adverb, noun³, preposition] + 'n.