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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. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| watt-hour | |
| —n | |
| a unit of energy equal to a power of one watt operating for one hour. 1 watt-hour equals 3600 joules | |
| watt-hour
A unit of energy, especially electrical energy, equal to the work done by one watt acting for one hour. It is equivalent to 3,600 joules. |