Current definitions.

From Wikipedia... (This changes daily, so click here to see the most recent).

Knowledge is the confident understanding of a subject, potentially with the ability to use it for a specific purpose. The ability to know something is a central (and controversial) part of philosophy and has its own branch, epistemology. On a more practical level, knowledge is commonly shared by groups of people and in this context it can be manipulated and managed in various ways.

From Britannica:

a posteriori knowledge
knowledge derived from experience, as opposed to a priori knowledge (q.v.).
a priori knowledge
in Western philosophy since the time of Immanuel Kant, knowledge that is independent of all particular experiences, as opposed to a posteriori knowledge, which derives from experience alone. The ...
Pramana-varttika
perhaps the foremost work on Buddhist logic and epistemology, written in the 7th century. The Pramana-varttika is the chief work of Dharmakirti, originally a southern Indian Brahman.
Agama post-Vedic scripture conveying ritual knowledge and considered to have been revealed by a personal divinity. Shaivite scriptures, dating probably to the 8th century, are particularly so designated, ... abhijna
in Buddhist philosophy, miraculous power obtained especially through meditation and wisdom. Usually five kinds of abhijna are enumerated: the ability (1) to travel any distance or take on any form at ... Royal Society
the oldest scientific society in Great Britain and one of the oldest in Europe, founded in 1660. It began earlier with small, informal groups, who met periodically to discuss scientific subjects. The ... gai saber
the art of composing love poetry; especially the art of the Provençal troubadours as set forth in a 14th-century work called the Leys d'amors. The Old Provençal phrase gai saber is associated with ...
Knowledge
from the salvation article
Religions that trace the ills of man's present condition to some form of primordial error, or ignorance, offer knowledge that will ensure salvation. Such knowledge is of an esoteric kind and is ...
Transmitting knowledge
from the technology, history of article
In the ancient world, technological knowledge was transmitted by traders, who went out in search of tin and other commodities, and by craftsmen in metal, stone, leather, and the other mediums, who ...
Self-knowledge
from the Locke, John article
Some ideas are not of things outside the mind but are reflexive and internal. Locke finds it necessary to classify these in Book II and in doing so sets down the foundations of empirical psychology. ...

From Dictionary.com

knowledge n : the psychological result of perception and learning and reasoning [syn: cognition, noesis]) Pronunciation Key (nlj)
n. The state or fact of knowing. Familiarity, awareness, or understanding gained through experience or study. The sum or range of what has been perceived, discovered, or learned. Learning; erudition: teachers of great knowledge. Specific information about something. Carnal knowledge.
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The problem we had have in IT , is that these definitions do not translate into bits and bytes and into a practical model we can build. As Scott Berkun writes in his book The art of project management, about the principle from a 12th century philosopher William of Occam whose credited with using the notion of simplicity to drive decisions (as reviewed earlier). "He believed that people often add complexity to situations even though it doesn't help to resolve them. He suggested that the best way to figure out things out was to find the simplest explanation and use that first because, most of the time, it was the right explanation. "
"Occam Razor refers to the process of trying to cut away all the unneeded details that get in the way and return to the core issue at the heart of the problem. It also implies that the solution with the greatest odds of being best is the one that has the simplest logic". I hopeful that what I am writing about knowledge follow this principle.