Lust is an intense desire or craving. Lust can take many forms such as the lust for knowledge, the lust for sex or the lust for power. It can take such mundane forms as the lust for food as distinct from the need for food. Lust is a powerful psychological feeling producing intense wanting for an object, or circumstance fulfilling a it. Many religions separate the definition of passion and lust by further categorizing lust as type of passion for something that does not belong to oneself.
n Old English (and several related Germanic languages), "lust" referred generally to desire, appetite, or pleasure. The sense of "to have a strong sexual desire (for or after)" is first seen in biblical use in the 1520s.
Today, the meaning of the word still has differing meanings as shown in the Merriam-Webster definition. Lust is:
a: pleasure, delight b: personal inclination: wish
intense or unbridled sexual desire: lasciviousness
a: intense longing: craving, a lust to succeed b: enthusiasm, eagerness, admired his lust for life.