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

• sewage works
• Seward
• Seward Peninsula
• Seward's Folly
• sewed
• sewellel
• sewen
• sewer
• sewer gas
• sewer line
• sewer main
• sewer rat
• sewer system
• sewer water
• sewerage
• sewin
• sewing
• sewing basket
• sewing kit
• sewing machine
• sewing needle
• sewing room
• sewing stitch
• sewing-machine operator
• sewing-machine stitch