Ac-cĕs'sa-ry, a.
a. 1. Additional; accessory.
Amongst many secondary and accessory causes that support monarchy, these are not of least reckoning. Milton.
Sense 2. (Law.) Uniting in, or contributing to, a crime; as, he was accessary to rebellion.
☞ Ash accents the antepenult; and this is preferable, from the difficulty of accenting the first syllable, as marked by most orthoëpists.