To find the correct one-word substitute for the given phrase, "Someone who has been admitted to membership in a scholarly field," we must evaluate each option:
- Scholar: Typically refers to someone who is highly educated or has an expertise in a particular academic discipline. However, it doesn't specifically imply formal admission into a scholarly field.
- Researcher: This term is used for someone who conducts academic or scientific research, but it doesn't necessarily imply their admission into a formal scholarly membership.
- Academician: This term is used to describe someone who is a member of an academic institution or works in an academic environment, often implying membership in an educational institution. This could fit, but it doesn't directly indicate a specific scholarly field membership.
- Savant: This refers to a person of profound or extensive learning; learned scholar. While it often implies special insight or exceptional expertise, it can also suggest formal recognition and admission into a specialized knowledge field.
- Pollster: This refers to a person who conducts or analyzes opinion polls, which is unrelated to being a member of a scholarly field.
Given the context of the phrase, "Savant" is the option that most closely aligns with someone having been formally recognized and admitted into a knowledgeable or learned group. It implies profound knowledge, often acknowledged by their peers in a particular scholarly domain. Therefore, the correct answer is "Savant".