1. Nearest in space or position; immediately adjoining without intervening space
   "our rooms were side by side"
   - adjacent, next 
2. Closely related or associated
   "a city in which communism and democracy had to live side by side"

See also: close, related, related to

• truck farm
• truck farming
• truck garden
• truck stop
• truck traffic
• truckage
• trucker
• truckie
• trucking
• trucking company
• trucking industry
• trucking rig
• truckle
• truckle bed
• truckler
• truckling
• truckload
• truculence
• truculency
• truculent
• truculently
• Trudeau
• trudge
• trudger
• true