Syn"chro*nous*ly

from The Collaborative International Dictionary of English v.0.48

Synchronous \Syn"chro*nous\, a. [Gr. ?; sy`n with + ? time. Cf.
   {Chronicle}.]
   Happening at the same time; simultaneous. --
   {Syn"chro*nous*ly}, adv.
   [1913 Webster]