Source : Webster's Revised Unabridged Dictionary (1913)

Alongside \A*long"side`\, adv.
   Along or by the side; side by side with; -- often with of;
   as, bring the boat alongside; alongside of him; alongside of
   the tree.

Source : WordNet®

alongside
     adv : side by side; "anchored close aboard another ship" [syn: {aboard}]