Notion: meaning, definitions and examples

Use when you want to refer to a general or vague understanding or idea of something. It can also imply an opinion that's not well-founded.

• She had a notion that he was lying.
• The notion of time travel fascinates many people.

Use when referring to an abstract idea or a mental construct that is more developed and clearly defined. It is often used in academic and professional discussions.

• The concept of gravity explains why objects fall to the ground.
• She introduced a new concept in her design project.

Use when you have a thought or plan that is not fully formed but is more concrete than a notion. It can be used in a wide range of contexts.

• I have an idea for our next vacation.
• His idea to improve the process was well-received.

Use when you want to talk about something that someone accepts as true or real, often without proof. It can be based on faith, tradition, or personal conviction.

• His belief in hard work helped him achieve his goals.
• The belief in ghosts is common in many cultures.

Use 'notion' when referring to a general idea or understanding, often an idea held without much deep consideration.

• She had a vague notion that they might be late.
• The notion of going abroad for vacation was exciting.

Use 'theory' when referring to a well-substantiated explanation of an aspect of the natural world that has been repeatedly tested and confirmed through observation and experimentation.

• Einstein's theory of relativity changed our understanding of physics.
• They proposed a new theory about the origin of the universe.

Use 'belief' when talking about something someone accepts as true or real, often without proof. It can be related to religion, trust, or personal convictions.

• Her belief in hard work is evident in her success.
• He holds a strong belief in the importance of honesty.

Use 'concept' when referring to an abstract idea or a mental representation of something. It is often used in academic, scientific, or technical contexts.

• The concept of gravity was revolutionary in physics.
• She explained the concept of democracy to the students.

Appropriate for expressing an idea, belief, or concept that someone has.

• She had the notion that studying abroad would broaden her horizons
• Despite the challenges, his notion of starting a business never wavered

Used for a sudden, unpredictable change of mind or desire, often seen as impulsive or quirky.

• They decided to go to the beach on a whim
• Her whims often led to unexpected and fun adventures

Best for describing a sudden, spontaneous urge or instinctive drive to act without thinking deeply.

• On an impulse, he bought tickets to the concert
• She had an impulse to call her old friend out of the blue

Typically used to indicate a liking or desire for something, often whimsically or without serious intention.

• Do you fancy going out for dinner tonight? As a child, she fancied herself as a famous artist