The Collaborative International Dictionary of English v.0.48:
knowledgeable \knowledgeable\ adj.
1. thoroughly acquainted with and skilled in something
through study or experience; as, knowledgeable in
classical languages. Opposite of unversed,
unacquainted, and unfamiliar.
2. fully informed.
3. highly educated; having information or understanding.
Syn: enlightened, learned, lettered, literate, well-educated,
[WordNet 1.5] -- knowledgeability, n. --
knowledgeably, adv. -- knowledgeableness, n.