What's the difference between "the main reason" and "the chief reason"? I've heard both, but have no idea where exactly these two differ.
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Why stop with two? You can also speak of the prime reason, the central reason, the primary reason, the principle reason, the foremost reason, the predominant reason and the pre-eminent reason. Like main and chief, they have much the same meaning, but are likely to be found in different contexts. Only a corpus search can reveal what those contexts might be.