Lacking nothing essential to the whole; complete of its nature or kind. Being without defect or blemish: a perfect specimen. Thoroughly skilled or talented in a certain field or area; proficient. Completely suited for a particular purpose or situation: She was the perfect actress for the part. Completely corresponding to a description, standard, or type: a perfect circle; a perfect gentleman. Accurately reproducing an original: a perfect copy of the painting. Complete; thorough; utter: a perfect fool. Pure; undiluted; unmixed: perfect red. Excellent and delightful in all respects: a perfect day. Botany Having both stamens and pistils in the same flower; monoclinous. Grammar Of, relating to, or constituting a verb form expressing action completed prior to a fixed point of reference in time. Music Designating the three basic intervals of the octave, fourth, and fifth. Grammar The perfect tense. A verb or verb form in the perfect tense. To bring to perfection or completion.