Source : Webster's Revised Unabridged Dictionary (1913)

Expeditious \Ex`pe*di"tious\, a.
   Possessed of, or characterized by, expedition, or efficiency
   and rapidity in action; performed with, or acting with,
   expedition; quick; having celerity; speedily; as, an
   expeditious march or messenger. -- {Ex`pe*di"tious*ly}, adv.
   -- {Ex`pe*di"tious*ness}, n.

   Syn: Prompt; ready; speedy; alert. See {Prompt}.

Source : WordNet®

expeditiously
     adv : in an efficient manner; "he functions efficiently" [syn: {efficiently},
            {with efficiency}] [ant: {inefficiently}]