Accrete is a verb that refers to the process of something growing or accumulating gradually over time. Synonyms for accrete include accumulate, amass, build up, grow, increase, thicken, and augment. These words all describe the act of adding to or building upon something over time. Another synonym for accrete is aggregate, which suggests the combination of separate parts into a larger whole. Synonyms for accrete can be used in a variety of contexts, ranging from the natural accumulation of sediment to the gradual growth of a business or organization. Whatever the context, these synonyms convey a sense of growth, expansion, and accumulation over time.