In the sense I meant it, depending on the recipe, it could be just a tiny bit between the thumb and forefinger, or half a handful.
When I curl my hand, it makes a depression that holds a teaspoon. When I open my hand more it becomes a tablespoon. If you have to be anal about measurement, use aliquot portions and things will usually work out. Unless you're baking, in which case all bets are off.