1 a: of second rank, importance, or value b: of, relating to, or constituting the second strongest of the three or four degrees of stress recognized by most linguists <the fourth syllable of basketball team carries secondary stress>cof a tense: expressive of past time 2 a: immediately derived from something original, primary, or basic b: of, relating to, or being the induced current or its circuit in an induction coil or transformer <secondary voltage>c: characterized by or resulting from the substitution of two atoms or groups in a molecule <a secondary salt>; especially: being, characterized by, or attached to a carbon atom having bonds to two other carbon atoms d (1): not first in order of occurrence or development (2): dependent or consequent on another disease or condition <secondary hypertension>(3): produced by activity of formative tissue and especially cambium other than that at a growing point <secondary growth><secondary phloem> 3 a: of, relating to, or being the second order or stage in a series b: of, relating to, or being the second segment of the wing of a bird or the quills of this segment c: of or relating to a secondary school <secondary education>