ALL meanings of modal auxiliary
mod·al aux·il·ia·ry
M m - noun modal auxiliary Grammar. any of the group of English auxiliary verbs, including can, could, may, might, shall, should, will, would, and must, that are used with the base form of another verb to express distinctions of mood. 1
- noun modal auxiliary an auxiliary verb that is used with another verb to indicate its mood, as can, could, may, might, must, shall, should, will, and would 0