adjective Having the power to move heavy weights or perform other physically demanding tasks. (she cut through the water with her strong arms) Able to withstand great force or pressure. (cotton is strong, hard-wearing, and easy to handle) Very intense. Used after a number to indicate the size of a group. (a hostile crowd several thousand strong) Denoting a class of verbs in Germanic languages that form the past tense and past participle by a change of vowel within the stem rather than by addition of a suffix (e.g. swim, swam, swum). Relating to or denoting the strongest of the known kinds of force between particles, which acts between nucleons and other hadrons when closer than about 10⁻¹³ cm (so binding protons in a nucleus despite the repulsion due to their charge), and which conserves strangeness, parity, and isospin.