Dissertational is a term that refers to anything that pertains to a dissertation or a formal, extended piece of writing on a particular subject. If you need to find synonyms for the word "dissertational," you may consider words like dissertation-like, thesis-related, academically-focused, or scholarly-oriented. Other possible synonyms include academic, erudite, discursive, expository, and learned. You can also use words like analytical, argumentative, critical, or investigative to describe a work that is dissertational in nature. Ultimately, the best synonym for the word "dissertational" depends on the context and purpose of your writing.