Definition of ourn in English:
ourn
(also our'n)
pronoun
Southern, Midlands, South Midland, New England, English Regional, United States Regional
Origin
Late Middle English; earliest use found in The Wycliffite Bible (early version). Alteration of our, after mine, thine. Compare hern, his'n, theirn, yourn.
Pronunciation
ourn
/ˈaʊən//ɑːn/