The word "coefficiently" refers to the manner in which coefficients are used in mathematical equations. Some synonyms for this word include "mathematically," "logically," "precisely," and "scientifically." Other words that can be used in place of "coefficiently" include "systematically," "rationally," "methodically," and "logistically." Each of these words conveys a similar meaning to "coefficiently," and can be used to describe the process of using coefficients in mathematical equations or other calculations. Whether you are a student working on a math assignment or a researcher conducting complex calculations, using these synonyms can help you effectively communicate the precision and accuracy of your work.