Exam: Cambridge English: C2 Proficiency (CPE)

Definition: A rare and radioactive metal that glows in the dark and is found in small amounts in certain minerals. It is used in medical treatments and in some types of paints that shine.

Example: Radium was once commonly used in cancer treatment before safer alternatives were discovered.

Definition: To become less dense or more thin, often referring to air or other substances.

Example: As the altitude increases, the air begins to rarefy, making it harder to breathe.

Definition: To make something thinner or less dense, often by removing some of its substance or impurities.

Example: The scientist aimed to rarefy the gas in the chamber to study its properties.

Definition: The act of formally agreeing to a treaty, contract, or agreement, which makes it officially valid.

Example: The ratification of the treaty was celebrated by both countries.

Definition: This word describes something that is connected to careful and logical thinking or reasoning.

Example: Her ratiocinative approach helped solve the complex problem efficiently.

Definition: Relating to a type of gene that does not show its effect unless two copies are present, often overshadowed by a dominant gene.

Example: In genetics, a recessive trait will only appear if an individual inherits the same recessive allele from both parents.

Definition: A type of gene or trait that does not show its effect unless two copies are present in an organism.

Example: The child inherited a recessive trait from both parents, resulting in blue eyes.

Definition: A legal agreement where a person promises to do something, often to appear in court, usually involving a sum of money as a guarantee.

Example: He was released on his own recognizance, promising to return for his court date.

Definition: The process of producing new coins or changing the design of existing coins.

Example: The government decided to implement a recoinage to update the currency's design.

Definition: Something that is not easily understood or is hidden from common knowledge.

Example: The professor's lecture on quantum physics was filled with recondite concepts that confused most of the students.

Definition: The quality of being difficult to understand or known only to a few people; it often refers to complex or obscure knowledge.

Example: The reconditeness of the subject made it challenging for the students to grasp the concepts.

Definition: The act of returning property to its previous owner.

Example: The reconveyance of the land was completed after the legal process.