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Loyalty is a feeling of solidarity and commitment that unifies the needs and expectations of a social unit (for example, the family) and "the thinking, feelings and motivations of each member" (Boszormenyi - Nagy, & Spark, 1973, p. xix).

Definition extracted with permission from Simon, Fritz, et al, Family Process, Inc.: Language of Family Therapy: A Systemic Vocabulary and Source Book (Family Process Press Series)