| fixed point | |
| —n | |
| 1. | physics a reproducible invariant temperature; the boiling point, freezing point, or triple point of a substance, such as water, that is used to calibrate a thermometer or define a temperature scale |
| 2. | maths a point that is not moved by a given transformation |
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| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| a chattering or flighty, light-headed person. |