Tertiary Attraction is a term from aro-spec communities to describe forms of attraction other than romantic and sexual. Typically romantic relationship contain a mix of all of these forms of attraction, but, because one or more form of attraction is missing it becomes easier for a-spec people to point out alternate forms of attraction.
While often dismissed by society tertiary attractions can be felt just as strongly as the attraction experienced by alloromantics/sexuals. Those who are aroace and feel like their tertiary attraction is important enough to warrant a place along side their aroace identity may identity as oriented aroace. Those who are ace-spec or aro-spec may identify as angled aroace.
Tertiary attractions can be given modifiers using the usual prefixes. For example one can be bialterous, meaning they experience alterous attraction towards people of two or more genders.
Tertiary attraction is named such because romantic and sexual attraction are typically split into the 'main' two attractions using the split attraction model.