modal (Adjective) — (statistics) relating to or constituting the most frequent value in a distribution. ex. "the modal age at which American novelists reach their peak is 30"
modal (Adjective) — Of or relating to a musical mode; especially written in an ecclesiastical mode.
modal (Adjective) — Relating to or expressing the mood of a verb. ex. "modal auxiliary"
modal (Noun) — An auxiliary verb (such as 'can' or 'will') that is used to express modality.