| open day | |
| —n | |
| Also called: at-home, US and Canadian name: open house an occasion on which an institution, such as a school, is open for inspection by the public | |
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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 screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |