suppletion

1. (uncountable, usually)The supplying of something lacking.

   пополне́ниеpopolnénije, восполне́ниеvospolnénije

2. (uncountable, usually)The use of an unrelated word or phrase to supply inflected forms otherwise lacking, e.g. using “to be able” as the infinitive of “can”, or “better” as the comparative of “good”, or “went” as the simple past of “go”.

   Suppletion, Suppletivismus

   супплетиви́змsuppletivízm, супплети́вностьsuppletívnostʹ

   суплетивізмsupletyvizm

3. (uncountable, usually)More loosely, the use of unrelated (or distantly related) words for semantically related words which may not share the same lexical category, such as father/paternal or cow/bovine, normally referred to as collateral adjectives.

uncountable