“Whatever is dependently co-arisen, that is explained to be emptiness.”
— NāgārjunaMūlamadhyamakakārikā XXIV.18 (translation varies)

Commentary

Nāgārjuna identifies emptiness (śūnyatā) with dependent origination: because things arise through causes and conditions, none has fixed, independent existence. Emptiness is therefore a description of relationality, not a metaphysical void.