The term 'notably influential' can be summarized by the word 'seminal, ' which means having a lasting and significant impact. This term is often used to describe people, ideas, or works that have had a major influence on their respective fields. For example, a seminal work of literature might be one that has had a profound effect on the way literature is written and read today. Similarly, a seminal figure in a field of study might be someone who has made groundbreaking contributions to the field.