What does "scepticism" mean?

Alternative spelling of skepticism.

Scepticism

Common synonyms include: disbelief, incredulity, skepticism, agnosticism, caution, critical doubt.

noun

noun ·Uncommon ·Advanced level

Noun

1
Alternative spelling of skepticism. UK, alt-of, alternative, countable, uncountable
"When, across the hundredfold poor scepticisms, trivialisms and constitutional cobwebberies of Dryasdust, you catch any glimpse of a William the Conqueror, a Tancred of Hauteville or suchlike, — do you not discern veritably some rude outline of a true God-made King […]?"
2
doubt about the truth of something wordnet
3
the disbelief in any claims of ultimate knowledge wordnet

"Dr Tyler expressed scepticism at Dr Ramsay's revolutionary new therapy."

Equivalent to sceptic + -ism.