Definition

A set of ideas or principles that explain something or guide understanding, often based on evidence and used to make predictions.

Example

The scientist proposed a new theory about how the universe began.

Conversation

Have you heard about that new theory in physics?

Yeah, it sounds really fascinating!

I wonder how it could change our understanding of the universe.

It might even lead to new discoveries we can't imagine yet!

Synonyms & Antonyms

Root Explanation

Theory → It is derived from the Greek word "theoria" (meaning contemplation or speculation), which comes from "theorein" (meaning to look at or to observe). The word "theory" refers to a system of ideas intended to explain something, based on observation and contemplation.

Memory Tip

Think of 'theoria' as a way of 'looking at' or 'observing' ideas — that's why a theory is a way to explain what you observe.

Visually Confused Words