New chemical species AB, each molecular entity of which is formed by direct combination of two separate molecular entities A and B in such a way that there is change in connectivity, but no loss, of atoms within the moieties A and B.

Note 1: Stoichiometries other than 1:1 are also possible, e.g. a bis-adduct (2:1). An ‘intramolecular adduct’ can be formed when A and B are groups contained within the same molecular entity.

Note 2: This is a general term which, whenever appropriate, should be used in preference to the less explicit term complex. It is also used specifically for products of an addition reaction.