principal part

1. (usually plural)Any of the forms of a word which contain its stem(s) in the simplest form, or such a form that, when taken with all the other principal parts (showing various inflections), allows the entire paradigm to be derived.

   Holonyms: declension, conjugation

   Stammform

2. A polynomial approximation of a power series, made up of monomials whose indices lie in the Newton diagram of the power series and which occur with the same coefficients as in the original power series.

3. The portion of a Laurent series that has negative exponents.

4. Used other than figuratively or idiomatically: see principal, part.

5. (obsolete, usually plural)Any one of however many parts of speech regarded as the most fundamental or indispensable.

   Holonym: part of speech

6. Any one of however many parts of speech regarded as the most fundamental or indispensable.

   (obsolete, usually plural, rare)The noun, verb, or adverb.

7. (obsolete, usually plural)The noun or the verb.

regular