\Ac*ces"sa*ry\ (#; 277), a.
Accompanying, as a subordinate; additional; accessory; esp.,
uniting in, or contributing to, a crime, but not as chief
actor. See {Accessory}.
      To both their deaths thou shalt be accessary. --Shak.
      Amongst many secondary and accessary causes that
      support monarchy, these are not of least reckoning.
                                               --Milton.

\Ac*ces"sa*ry\ (277), n.; pl. {Accessaries}. [Cf.
{Accessory} and LL. accessarius.] (Law)
One who, not being present, contributes as an assistant or
instigator to the commission of an offense.
{Accessary before the fact} (Law), one who commands or
   counsels an offense, not being present at its commission.
{Accessary after the fact}, one who, after an offense,
   assists or shelters the offender, not being present at the
   commission of the offense.
Note: This word, as used in law, is spelt accessory by
      Blackstone and many others; but in this sense is spelt
      accessary by Bouvier, Burrill, Burns, Whishaw, Dane,
      and the Penny Cyclopedia; while in other senses it is
      spelt accessory. In recent text-books on criminal law
      the distinction is not preserved, the spelling being
      either accessary or accessory.