adjective
Definition: Relating to the mood or manner in which something is expressed, especially in grammar, logic, music, or philosophy.
Example: In English, modal verbs like 'can' and 'must' are used to express ability or necessity.
noun
Definition: A type of word that expresses possibility, necessity, or ability, often used with other verbs to indicate mood or tense.
Example: In the sentence 'You should go to the doctor', 'should' is a modal that suggests advice.