Low or lower in order, degree, or rank: Captain is an inferior rank to major. Low or lower in quality, value, or estimation: inferior craft; felt inferior to his older sibling. Second-rate; poor: an inferior translation. Situated under or beneath. Botany Located below the perianth and other floral parts. Used of an ovary. Anatomy Located beneath or directed downward. Printing Set below the normal line of type; subscript. Astronomy Orbiting between Earth and the sun: Mercury is an inferior planet. Astronomy Lying below the horizon. A person lower in rank, status, or accomplishment than another. Printing An inferior character, such as the number 2 in CO2.