This is a Japanese-style character form; standard Chinese writes the word as 旷.
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昿 is a Japanese simplified (shinjitai-style) form of 曠. It is not used in standard written Chinese — the equivalent character is 旷 (vast / open / to waste or neglect, as in 旷工 'to skip work').
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Seen in Japanese contexts and variant-form notes only; a Chinese reader should use 旷.
