modal

nouns

an auxiliary verb (such as `can' or `will') that is used to express modality

adjectives

relating to or constituting the most frequent value in a distribution
"the modal age at which American novelists reach their peak is 30"
is derived from
of or relating to a musical mode; especially written in an ecclesiastical mode
is derived from
pertains to
relating to or expressing the mood of a verb
"modal auxiliary"
is derived from
is derived from
pertains to