The term "by-purpose" refers to something that is intentionally done or carried out with a specific objective or aim in mind. Synonyms for the word "by-purpose" include "intentional", "deliberate", "planned", "purposeful", "calculated", and "willful". These words all convey the idea of a conscious decision being made and actions being taken with a clear goal in sight. Using these synonyms adds descriptive nuance to one's writing and can help to clarify the intended meaning of a sentence or passage. It is important to select the appropriate synonym based on the context of a particular statement, as each of these words has a slightly different connotation.