'Scepticism' definitions:

Definition of 'scepticism'

noun

The disbelief in any claims of ultimate knowledge [syn: agnosticism, skepticism, scepticism]

From: GCIDE

Sceptic \Scep"tic\, Sceptical \Scep"tic*al\, Scepticism \Scep"ti*cism\, etc. See Skeptic, Skeptical, Skepticism, etc. [1913 Webster]

From: GCIDE

Skepticism \Skep"ti*cism\, n. [Cf. F. scepticisme.] [Written also scepticism.]
1. An undecided, inquiring state of mind; doubt; uncertainty. [1913 Webster]
That momentary amazement, and irresolution, and confusion, which is the result of skepticism. --Hune. [1913 Webster]
2. (Metaph.) The doctrine that no fact or principle can be certainly known; the tenet that all knowledge is uncertain; Pyrrohonism; universal doubt; the position that no fact or truth, however worthy of confidence, can be established on philosophical grounds; critical investigation or inquiry, as opposed to the positive assumption or assertion of certain principles. [1913 Webster]
3. (Theol.) A doubting of the truth of revelation, or a denial of the divine origin of the Christian religion, or of the being, perfections, or truth of God. [1913 Webster]
Let no . . . secret skepticism lead any one to doubt whether this blessed prospect will be realized. --S. Miller. [1913 Webster]