Pertaining to, or designating, a verb which forms its preterit (imperfect) by a variation in the root vowel, and the past participle (usually) by the addition of -en (with or without a change of the root vowel); as in the verbs strive, strove, striven; break, broke, broken; drink, drank, drunk. Opposed to weak, or regular. See Weak.
Applied to forms in Anglo-Saxon, etc., which retain the old declensional endings. In the Teutonic languages the vowel stems have held the original endings most firmly, and are called strong; the stems in -n are called weak other constant stems conform, or are irregular.