I recently saw a shared post on Facebook which states
Trees - even a young child knows what a Tree is, however there is surprisingly no universally recognised precise definition of what a tree is, either botanically or in common language. In its broadest sense, a tree is any plant with the general form of an elongated stem, or trunk.
Wikipedia points out (without citations)
In botany, a tree is a perennial plant with an elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree may be narrower, including only wood plants with secondary growth, plants that are usable as lumber or plants above a specified height. In wider definitions, the taller palms, tree ferns, bananas, and bamboos are also trees. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight.
I always considered palm trees and banana trees to be trees. Is it true that botanically, they are not trees? What is the true botanical definition of a tree?