Affection is a vital element of human relationships, providing an emotional foundation that supports well-being and mental health. The noun ' affection ' has its etymological roots in Latin. It is derived from the Latin word 'affectionem,' which is the past participle of 'afficere,' meaning 'to affect' or 'to influence.' In its original Latin sense, 'affectionem' referred to the act of being affected or influenced by something, often in an emotional or personal manner. The meaning of AFFECTION is a feeling of liking and caring for someone or something : tender attachment : fondness. How to use affection in a sentence. Affectation and Affection Synonym Discussion of Affection . AFFECTION definition : 1. a feeling of liking for a person or place: 2. feelings of liking or love: 3. to succeed in…. Learn more.