fruit: what a tree, vine, or field brings forth, and what a person or nation yields when pictured as a growing plant
This is the everyday, physical sense, and it accounts for most of the word's uses. It covers what a tree or vine bears (figs, grapes, pomegranates), what a worked field sends up, and, in an image the writers reach for constantly, what a person or a nation yields when they are drawn as a tree planted somewhere.
The three shades belong together because Hebrew sees one thing in all of them: the visible yield of a living, growing source. A tree's fruit, a field's harvest, and a people rooted and bearing are the same idea applied to a plant, to a field, and to a nation. Other Hebrew words stay narrower. What the soil sends up is יְבוּל, and the harvest once it has been gathered in is תְּבוּאָה, while this word names the fruit itself, wherever it grows.
In the law and the prophets this physical fruit is rarely neutral. A land heavy with fruit is a sign of blessing, and fruit that fails or withers is a sign of judgment. That is what makes the word so ready to carry the deeper senses below, and it is also the point of the polemic running through the prophets: the neighbouring nations credited their harvests to a storm god, and Israel's Scriptures insist on giving every kind of fruitfulness back to the God who made the tree.