Attachment/əˈtætʃmənt/ Definition 1 of 4Pro Tip 1/3Emotional Connection Refers to strong emotions tying one to people or things. She couldn't leave her hometown due to her attachment to it. Pro Tip 2/3Not Just Positive Can imply dependence or difficulty letting go. His attachment to his old car made selling it hard. Pro Tip 3/3Psychological Term Used in psychology to describe relationships between people. Attachment theory explains how we connect with others.