antiphonal

"During the school choir's performance, the effect of the antiphony, with one half of the choir singing a phrase and the other half answering, created a beautiful, echoing sound. "

"The design of his house incorporates a spiral staircase."

"My brother regularly takes the bus to school. "

"The choir practiced a new selection from the antiphonary, responding to the cantor's verses with harmonious chants. "

"The school's drama club director organized the play's rehearsals. "

"The customer service representative was very responsive to my questions, answering each one quickly and clearly. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"During the church service, the choir sang antiphons, with one group of singers answering the other in a beautiful call-and-response. "

"The alternate periods of rain and sunshine made for a very unpredictable afternoon. "

"Hey, beautiful!"

"The teacher characterized the student as disruptive in class. "

"the performance of an undertaking or a duty"