This appears to be a name or non-standard word without a clear standard English definition. In some contexts, it might refer to luck in informal speech.
If referring to luck, from Old Norse 'luki' meaning 'chance' or 'fate.' However, 'luc' as written is not standard English and may be a proper name, abbreviation, or regional variation.
Without more context, 'luc' is hard to define—it's a reminder that not all letter combinations are dictionary words, though it might be a nickname or abbreviation that has meaning in specific communities.
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