Downness

Each of the flavors has a corresponding property, so that the down quark carries "downness," although upness and downness are rarely mentioned,

Source: wiktionary

The down and antidown quarks on the left have a total downness of zero, which is preserved on the right.

Source: wiktionary

To some degree this feature determines the profiles themselves: upness in B and downness in A, but the downness of C, more than a downness of relaxation, is a downness of being held down.

Source: wiktionary

Walking down in the mornings, up in the afternoons, which, with the weight of the tomes, is the fundamental issue— downness, upness, when it should of course be upness, downness, the fall and the rise hardly ever to be spoken of at all, always the rise and fall of things, almost any sort of thing having its rise and then its fall, the rise necessarily preceding the fall […]

Source: wiktionary