desire, wish: what someone wants, nearly always in the set phrase "the desire of your soul," meaning as much and as freely as you please.
The word itself simply means wanting something. What makes it distinctive is where it turns up. Six of its seven appearances sit inside one set phrase, "the desire of your soul," and in almost all of them that phrase is not describing a private feeling. It is granting a free hand.
Deuteronomy uses it three times to open up ordinary meals. Once Israel had spread out too far to bring every animal to the one sanctuary, people could slaughter and eat at home, "with all the desire of your soul," which is to say as much as they liked and whenever they liked. The same phrase then licenses movement rather than appetite: a Levite may leave his hometown and come to the chosen place "with all the desire of his soul" (Deuteronomy 18:6), and the men of Ziph tell Saul to come down after David whenever he wishes (1 Samuel 23:20).
Two verses step outside the human wish. Jeremiah puts the phrase on a wild donkey in mating season, so that a word that usually means "whatever you feel like" becomes an urge the animal cannot be turned back from. And in Hosea, God speaks of his own desire as the reason he disciplines Israel: not an appetite but a settled will, closer to "when I choose."
This is the short member of a small family. The verb אָוָה is the act of wanting, and the longer noun תַּאֲוָה ranges much wider, from the craving that killed people in the wilderness to the longing of the faithful for God. This shorter noun settled into one phrase early and mostly stayed there.