Meaning of “modal verb” - Learner’s Dictionary

modal verb

noun [ C ] uk us /ˈməʊdəlˌvɜːb/ (also modal)

B1 a verb, for example 'can', 'might', or 'must', that is used before another verb to show that something is possible, necessary, etc

(Definition of “modal verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)