From Longman Dictionary of Contemporary Englishintonein‧tone /ɪnˈtəʊn $ -ˈtoʊn/ verb [transitive] formal ALRRto say something slowly and clearly without making your voice rise and fall much as you speak The priest intoned the blessing.→ See Verb table
Examples from the Corpus
intone• With each drop the name of the plague is intoned.• Even when the clergyman appeared from the vestry and began the service, the prayers he intoned brought me no help.• Loudly he intoned some short Latin prayer, then crossed himself again and turned.• That same year Iggy Pop intoned the chorus to her feminist ballad Daw da Hiya.• When I had studied it, very slowly, I used to intone the melody with which I had once studied Gemara.• Uncle Danny intoned the prayer in Hebrew.• The priest intoned the prayers in a nervous voice, pulling at his beard.Origin intone (1300-1400) Old French entoner, from Medieval Latin intonare, from Latin tonus; → TONE1 