Principal-parts
noun, (used with a plural verb) Grammar.
1.
a set of inflected forms of a form class from which all the other inflected forms can be derived, as sing, sang, sung; smoke, smoked.
principal parts
plural noun
1.
(grammar) the main inflected forms of a verb, from which all other inflections may be deduced. In English they are generally considered to consist of the third person present singular, present participle, past tense, and past participle
2.
the sides and interior angles of a triangle
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noun, Optics. 1. the point where a principal plane intersects the axis. principal point n. One of the two points in an optical system where the axis is cut by the two principal planes. Lines drawn from these to corresponding points on the object and the image will be parallel.
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- Principal-series
noun, Mathematics. 1. composition series. composition series noun, Mathematics. 1. a normal series of subgroups in which no additional subgroups can be inserted.