連吟 is read as れんぎん (rengin) and means duet.
れんぎん
rengin
れんぽう
commonwealth
れんめい
league
れんけつ
connection
れんさい
serialization
れんけい
integration
れんぱ
successive championships
れんたい
regiment
れんさ
linkage
mountain range
れんさはんのう
chain reaction
れんたいほしょう
joint liability on guarantee
れんけつき
connector