I notice the definitions for Moot are contradicting.

definitions: Open to debate (adj.). Having no legal significance (n.).

And even when searched in Google I get...

1. subject to debate, dispute, or uncertainty. 2. having little or no practical relevance, typically because the subject is too uncertain to allow a decision.

Am I wrong here? I always looked at moot as not mattering. But if it is open for debate, then does it not still matter? To me, moot means no worth debating any longer.