Beside, next to, as in Tom's canoe lay alongside of mine. [Late 1700s]
Together with, as in Her children played alongside of mine all summer long. [Late 1700s]
Compared to, as in My car doesn't look like much alongside of Dad's. [Colloquial; late 1800s]
Dictionary.com presents 366 FAQs, incorporating some of the frequently asked questions from the past with newer queries.