adjective
1. nearest in space or position; immediately adjoining without intervening space (Freq. 2)
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had adjacent rooms
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in the next room
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the person sitting next to me
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our rooms were side by side
• Similar to: ↑close
2. closely related or associated
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a city in which communism and democracy had to live side by side
• Similar to: ↑related, ↑related to
Useful english dictionary. 2012.