| plenum system | |
| —n | |
| a type of air-conditioning system in which air is passed into a room at a pressure greater than atmospheric pressure | |
| 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 fool or simpleton; ninny. |
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