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Definition of: addi
(ə·dish′ən) noun
1. The act of adding, or that which is added: an increase; annex; accession.
2. Math. The uniting of two or more arithmetical or algebraic quantities in one sum, indicated by the plus sign (+).
3. Law A title or mark of designation attached to a man's name. See synonyms under ACCESSION, APPENDAGE, INCREASE. [<F <L additio, -onis<addere.
See ADD.]