Definition: This word describes something that is directly related to the topic or issue being discussed.

Example: The lawyer presented pertinent evidence that helped the case.

Definition: A small change or disturbance in a system, often caused by external factors, that can affect its state or behavior.

Example: The scientist observed a perturbation in the satellite's orbit due to the gravitational pull of a nearby planet.

Definition: Relating to or caused by a disturbance or change in a system.

Example: The scientists studied the perturbational effects on the climate model.

Definition: A highly contagious bacterial infection that causes severe coughing fits, often referred to as whooping cough.

Example: The doctor diagnosed the child with pertussis after observing the characteristic cough.

Definition: To be present in every part of something; to spread throughout an area or a thing.

Example: The smell of fresh bread seemed to pervade the entire house.

Definition: Something that spreads throughout or is present everywhere.

Example: The scent of flowers was a pervader in the garden, filling the air with sweetness.

Definition: Having a tendency to spread throughout an area or a group of people.

Example: The pervasive influence of social media can be seen in many aspects of daily life.

Definition: In a way that spreads widely throughout an area or a group of people.

Example: The influence of technology has pervasively changed how we communicate.

Definition: The quality of being everywhere or spreading widely in a particular area or among a group of people.

Example: The pervasiveness of technology in our daily lives has changed how we communicate.

Definition: Able to allow things to pass through, such as water or air; not blocked or closed off.

Example: The soil in this area is pervious, allowing rainwater to seep into the ground easily.