Relating to or involving emption; concerning purchase or the act of buying.
From emption + -al (adjective-forming suffix), derived from Latin -alis (relating to), creating an adjective form meaning 'of or relating to emption or purchase,' following standard English derivational patterns.
Emptional is so rare that most dictionaries don't include it—it's a theoretical adjective form created by regular grammar rules but essentially never used because no one says 'emptional contract' when 'purchase contract' exists. It's a word that follows all the rules but nobody wants.
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