IPA: /ˌkɒp.jʊˈleɪ.tər.i/
KK: /kɑːˈpjuːləˌtɔːri/
Related to the act of mating or sexual reproduction.
The copulatory behavior of certain species is fascinating to observe.
Copulatory is formed from "copulatus" (meaning joined or linked) and the suffix "-ory" (meaning relating to or characterized by). The word describes something that is related to or characterized by joining or linking, particularly in the context of mating or reproduction.
Think of 'joining' ('copulatus') when you remember that 'copulatory' refers to something related to the act of joining, especially in reproduction.