Tis a gathering.
Meeting of Ents. Entmoots were held to discuss matters of importance. By the end of the Third Age these meetings had become rare.
Treebeard : "The ents have not troubled about the wars of men and wizards for a very long time. But now something is about to happen that has not happened for an age... Ent Moot."
Merry : "What's that ?"
Treebeard : "'Tis a gathering."
Merry : "A gathering of what ?"
Many Ents come out of the forest.
Treebeard : "Beech, oak, chestnut, ash... Good, good, good. Many have come. Now we must decide if the ents will go to war."
A gathering of Ents during a moment of great importance to the community. Usually involves conversations and debates on the deeper meanings behind the universe.
Dude, I just got a fresh batch of trees
...Call the boys, it's about time for an entmoot