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For questions about simplified Chinese (standardized in printing since the 1950s in mainland China). Not merely for questions which happen to be written in simplified Chinese.

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『說文解字』says it's "一大", and gives an explanation: 从一大。至高無上。是其大無有二也。故从一大。 That is, it means "highest", "biggest". You can interpret "一大" as "number 1 in terms of size".
answered Mar 13 '17 by congusbongus