suppletory

Suppletory is an adjective relating to suppletion, the linguistic and legal phenomenon of supplying forms or rules that do not derive from a single, shared source. The term comes from the Latin suppletorius, meaning to supply, from suppletus meaning supplied. In common usage, it appears mainly in linguistics and law.

In linguistics, suppletion describes irregular inflection where different forms of a word come from historically different roots. Classic English examples include be with am, is, are, was, were; go with went; see with saw. These inflected forms do not share a regular stem with the rest of the paradigm, illustrating a non-productive or historic separation of roots. Suppletion is relatively rare cross-linguistically but well documented, and it stands apart from regular phonological alternations and from derivational processes that build new forms from the same base.

In law, suppletory (or suppletive) rules are those that fill gaps left by explicit statutory provisions or formal rules. A suppletory clause or rule provides a default, transitional, or auxiliary rule to be applied when no express rule governs a case. This concept is discussed in civil law and comparative law, where authorities acknowledge the need for supplementary principles to ensure coherence and completeness of the legal system.

Alternative spellings include suppletive and suppletory; both appear in use, with slight regional or contextual preferences. The term remains most commonly encountered in discussions of irregular verb forms and in descriptions of legal mechanisms that bridge gaps in statutory schemes.