Close to; lying near:
The definition of nearby is close or not far away.
Side by side, facing forward. [First attested from around (1350 to 1470.)]
The definition of next is just before or after.
The definition of beside means by, along side, in comparison or near, or means not relevant.
(By extension) In very close or intimate association.
(Music) Moving in the same direction at a fixed interval:
Find another word for side-by-side. In this page you can discover 15 synonyms, antonyms, idiomatic expressions, and related words for side-by-side, like: adjacent, nearby, abreast, loyally, near, next, alongside, beside, cheek-by-jowl, cheek to cheek and juxtaposing.