Basic Guidelines For English Spellings
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1(forming adjectives) of the kind specified; relating to.
2Forming nouns such as scholar.
From Old French -aire, -ier, or from Latin -aris.
Forming nouns such as pillar.
Via Old French from Latin -are (neuter of -aris).
Forming nouns such as bursar, vicar.
From Old French -aire, -ier, or from Latin -arius, -arium.