conjugation

mastery
UK /ˌkɒnd͡ʒəˈɡeɪʃən/ US /ˌkɑnd͡ʒəˈɡeɪʃən/noun

card 1 of 10 · synonym

Which word is closest in meaning to “conjugation” in this sentence?

The conjugation of the two paramecia lasted several hours.