Selectivity plays a crucial role in organic synthesis. Selective reactions are most commonly categorized as chemoselective, 1,2 regioselective, and stereoselective. There is, however, one type of selectivity commonly encountered in various reactions (e.g. substitutions, polymerizations, etc.) that does not fit in these three categories. The purpose of this work is to present the selectivity observed when a given reaction can occur at least twice on a substrate (e.g. the alkylation of ethylene glycol, see Figure ) but stops selectively after a given number of iterations i. This is distinct from selectivity imposed through sequential reactions, and applies only to one-pot reactions. In 2014, we proposed to name this selectivity "iteroselectivity" 6 (Figure ) and, since then, this term was used in various articles. To the best of our knowledge, the concepts arising from this type of selectivity have not been yet properly named and defined in the literature.