Kiss/kɪs/ Definition 1 of 4Pro Tip 1/3Cultural sensitivity Kissing customs vary globally; research local customs to avoid misunderstandings. In some cultures, kissing on the cheek is a common greeting. Pro Tip 2/3Emotional intimacy A kiss can express deep emotional connections, not just romantic interest. She kissed her sleeping child's forehead softly. Pro Tip 3/3Social greetings In some social situations, a kiss is a polite way to say hello or goodbye. They kissed each other on the cheek at the party.