Ours
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wiktionary
From Middle English oures, attested since the 1300s. Equivalent to our + -s (compare -'s); formed by analogy to his. Displaced ourn (from Middle English ouren) in standard speech. [1]
etymonline
ours (pron.)
"that or those belonging to us," c. 1300, oures, a double possessive (with genitive suffix -s (1)), originating in northern England, it has taken over the absolute function of our (q.v.). In Middle English ourn, ouren also were used.
Ours is a later possessive form from our, and is used in place of our and a noun, thus standing to our in the same relation as hers to her, yours to your, mine to my .... [Century Dictionary]
