Our debut issue explores the ideas, people, and places shaping New York now. Discover new articles online, pick up in store, or preview exclusively on the Theory App. Join our mailing list for our latest …

The meaning of THEORY is a scientifically acceptable or plausible general principle or body of principles based on data and offered to explain phenomena. How to use theory in a sentence.

Theories are analytical tools for understanding, explaining, and making predictions about a given subject matter. There are theories in many and varied fields of study, including the arts and sciences.

Dec 5, 2025 · Attachment theory says that your first 24 months of life may predict much about your future relationships. Here’s why.

THEORY definition: a coherent group of tested general propositions, commonly regarded as correct, that can be used as principles of explanation and prediction for a class of phenomena. See examples of …

THEORY definition: 1. a formal statement of the rules on which a subject of study is based or of ideas that are…. Learn more.

A theory is a formal idea or set of ideas that is intended to explain something. Marx produced a new theory about historical change based upon conflict between competing groups.

The branch of a science or art consisting of its explanatory statements, accepted principles, and methods of analysis, as opposed to practice: a fine musician who had never studied theory.

A theory is a well-substantiated explanation or framework that is supported by evidence and reasoning, and seeks to understand and explain a phenomenon or set of phenomena.

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