Something that astonishes; an astonishing thing or event. / Someone who astonishes. / (typography, printing, computing, chiefly US) An exclamation mark, the punctuation mark “!”.

(software, user interface, design) A principle that the design should match the user's experience, expectations, and mental models.

In an astonishing manner; so as to surprise or astonish. / Very; remarkably used as an intensifier.

The state or quality of being astonishing.