What is another word for no more than one?
Pronunciation: [nˈə͡ʊmˌɔː ðɐn wˌɒn] (IPA) 
When referring to a singular item or entity, the phrase "no more than one" indicates a limit of just one. Synonyms for this phrase include "only one," "a single," "sole," "solitary," "individual," "unique," and "lone." These words convey the idea of exclusivity or restriction to just one object, person, or entity. For example, when discussing a household, one might say "there can be only one leader" or "there should be no more than one pet per family." By utilizing these synonyms, one can effectively communicate the idea of a limit of just one in a clear and concise manner.
