principal part

Noun

 * 1)  Any of the forms of a word which contain its stem(s) in the simplest form,  such a form that, when taken with all the other principal parts (showing various inflections), allows the entire paradigm to be derived.
 * 2)  A polynomial approximation of a power series, made up of monomials whose indices lie in the  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.
 * 1)  A polynomial approximation of a power series, made up of monomials whose indices lie in the  of the power series and which occur with the same coefficients as in the original power series.
 * 2)  The portion of a Laurent series that has negative exponents.

Usage notes

 * In Latin grammar: the two principal parts of a noun are the singular nominative and the singular genitive; the three of an adjective are the masculine, the feminine, and the neuter singular nominatives; and the four of a verb are the first-person singular present active indicative, the 1st-pers. sg. perfect act. ind., the pres. act. infinitive, and the supine (or, in the case of deponent verbs, the three are the 1st-pers. sg. pres. act. ind., the pres. act. inf., and the perf. act. participle).
 * In the grammars of most Germanic languages: the three principal parts of verbs are the present infinitive, the first-person singular imperfect indicative, and the passive participle.
 * In English grammar: the two principal parts of a noun are the singular and the plural; the three of an adjective are the positive, the comparative, and the superlative; and the three of a verb are the infinitive, the simple past, and the past participle.

Translations

 * Hungarian: szótári alak
 * Latin: principālis pars
 * Lithuanian: