Exam: TOEFL

Definition: A significant point that represents a change or division, often marking an important turning point in history or events.

Example: The invention of the internet was a watershed moment in communication.

Definition: A unit of power in the International System of Units, equal to one joule per second, used to measure the rate of energy transfer.

Example: The light bulb uses 60 watts of power.

Definition: A measure of electrical power, usually expressed in watts or kilowatts, that indicates how much energy an appliance or device uses.

Example: The wattage of the light bulb determines how bright it will be.

Definition: To move one's hand or an object back and forth or up and down as a way to greet or signal someone.

Example: She waved at her friend from across the street.

Definition: A shape or movement that rises and falls, like the motion of water or a hand gesture.

Example: The children played in the waves at the beach.

Definition: To move something back and forth or up and down, often to greet someone or get their attention.

Example: She waved her hand to say hello.

Definition: A visual or mathematical representation of a wave, showing its shape and characteristics like frequency and amplitude over time.

Example: The engineer analyzed the waveform to understand the signal's behavior.

Definition: A structure that directs and controls the movement of electromagnetic waves, often made of materials like glass or metal.

Example: The engineer designed a new waveguide to improve the signal transmission in the communication system.

Definition: The distance between two peaks of a wave, such as light or sound, or the distance between corresponding points in a wave.

Example: The color of light is determined by its wavelength.

Definition: To become unsteady or uncertain; to hesitate or fluctuate in decision or movement.

Example: She began to waver in her commitment to the project after hearing the negative feedback.

Definition: The action of being uncertain or indecisive, often shown by hesitation or fluctuation.

Example: His waver in decision made everyone anxious about the outcome.

Definition: A person who is indecisive or uncertain, often changing their mind frequently.

Example: As a waverer, she struggled to choose between the two job offers.

Definition: Not steady or firm; changing often; unsure about a decision or opinion.

Example: Her wavering voice showed that she was unsure of her answer.

Definition: To be indecisive or uncertain about something; to fluctuate or change one's mind.

Example: She was wavering between two job offers, unsure which one to accept.