Definition of modal (noun)
- an auxiliary verb (such as `can' or `will') that is used to express modality
Definition of modal (adjective)
- relating to or constituting the most frequent value in a distribution
- "the modal age at which American novelists reach their peak is 30"
- synonyms: average
- of or relating to a musical mode; especially written in an ecclesiastical mode
- relating to or expressing the mood of a verb
- "modal auxiliary"
Source: Princeton University Wordnet