Definitions

1. preposition

in or to the side of something or someone

“The boat sailed alongside the shore.”

2. adverb

in a position to the side of something or someone

“The cars drove alongside the parade.”

3. verb

to go or travel in the company of someone or something

“They decided to travel alongside each other.”

4. adverb

simultaneously with something or someone

“The two events took place alongside each other.”