The concept of concealed antiaromaticity helps resolve the argument about the terminology to be used for a class of molecules that feature both formal 4n and [4n+2] π-electron systems. Not introducing a new type of (anti)aromaticity, the term describes that a molecule behaves like an antiaromatic molecule under certain conditions rather than describing the (anti)aromaticity of its neutral ground state. Thereby, the term is not limited to antiaromatic molecules but can also be suitable for locally aromatic or nonaromatic molecules if they show the described behaviour. They can be classified as molecules with strongly concealed antiaromaticity, as opposed to molecules with weakly concealed antiaromaticity. In contrast to other terms that have been proposed, concealed antiaromaticity provides a more general framework for understanding and explaining the properties that arise from certain structural motifs. It can also serve as a blueprint for others to develop and explore further, better molecules and materials for various research areas and applications.