Coalitional is an adjective used to describe something related to an alliance or coalition. There are many other similar words that can be used instead of coalitional, including collaborative, united, combined, joint, cooperative, and conjunctive. Collaborative means working together towards a common goal, while united means being together as one entity. Combined means to have two or more things working together, while joint refers to something that is shared or done together. Cooperative means working together willingly, and conjunctive means two or more groups working together in harmony. All of these terms could be used in place of coalitional depending on the context and meaning desired in a particular sentence or passage.