preposition
1.
a. : side by side with : parallel to
a car parked alongside of the curb
b. : in company with : at the side of
the son fought alongside of his father
2. : in comparison with
a player who can stand up well alongside of the best
preposition
1.
a. : side by side with : parallel to
a car parked alongside of the curb
b. : in company with : at the side of
the son fought alongside of his father
2. : in comparison with
a player who can stand up well alongside of the best
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012