Addition compounds include donor-acceptor complexes, formed by the interaction of independently existing species in definite stoichiometric proportions, lattice compounds and castrate compounds. Earlier the suffix ate had been used to name the addition compounds, as for example, hydrates form water, ammoniates form ammonia, alcoholates form alcohols. etherates form ethers. Although such names continue but IUPAC recommends that it be allowed (but not preferred) only for hydrates because suffix-ate is restricted to anions.

Addition compounds are now named by connecting the names of the individual compounds (entities) by spaced hyphens. The number of molecules are indicated by Arabic numbers, separated by a solidus and enclosed in parentheses.

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