Rootem

Rootem is a term that has appeared in several technical contexts but does not have a single, widely accepted definition. It is generally used to refer to a root-related form of a word, but its precise meaning varies by field and author. In some linguistic discussions, rootem is described as a canonical root form that remains after removing or normalizing inflectional affixes, similar to a lemma, though not standardized. In this sense, rootem can be thought of as an intermediate representation used in lexicographic databases or morphological analyses.

In computational linguistics and information retrieval, rootem is sometimes used as a label for the stored representation of a word's base form within a dataset or pipeline. Depending on the system, the rootem may correspond to a traditional lemma, the stem produced by a stemmer, or a linguistically grounded base form identified by a morphology analyzer. Because there is no universal agreement on its definition, the exact method for deriving a rootem is project-specific.

Because rootem overlaps with established terms like root, stem, and lemma, researchers typically define it at the outset when used. See also lemma, stem, root, and morpheme.