Ai no Imi wo Oshiete! (愛の意味を教えて!; Teach Me the Meaning of Love) is the fifth single of the Hello! Project group, W. It was released on May 18, 2005 on the Zetima label, the single V was released on June 1, 2005 under the same label. The single was to be included on W's third studio album, W3: Faithful, but due to Kago Ai's smoking scandal and resultant termination of her contract, the album was cancelled. The song has a Devo-inspired synthesized pop beat, and is one of W's original songs. The song was used as the theme song of the TV program, "Chuunen!" (っちゅ～ねん!).
The single peaked at #11 on the Oricon charts and sold 21,408 copies overall. The single V peaked at #3 and sold 7,530 copies overall.