Functional Knowledge
Kyle Amon,  Page 9 

Since we can't know anything for certain, we need an approach, a methodology, whereby we may yet function while burdened with absolute ignorance.

Knowledge then, for us, is functional knowledge, based on experience of phenomena.  

Phenomenon
n. 1. An occurance, a circumstance, or fact that is perceptible by the senses. 2. pl. -nons. a. An unusual, significant, or unaccountable fact or occurance; a marvel. b. A remarkable or outstanding person; a paragon. See Syns at WONDER. 3. Philos. a. That which appears real to the mind, regardless of whether it's existance is proved or it's nature understood. b. In Kantian philosophy, the appearance of an object to the mind, as opposed to its existence independent of the mind. 4. Phys. An observable event.

Usage Note: Phenomenon is the only singular form of this noun; phenomena is the usual plural. Phenomenons may also be used as the plural in nonscientific writing when the meaning is "extraordinary things, occurrences, or persons."