---
title: "Similarity — AP Psychology Definition & Exam Guide"
description: "Similarity is both a Gestalt principle (we group things that look alike) and a top predictor of attraction in AP Psych. See how it connects perception and social psych."
canonical: "https://fiveable.me/ap-psych-revised/key-terms/similarity"
type: "key-term"
subject: "AP Psychology"
---

# Similarity — AP Psychology Definition & Exam Guide

## Definition

In psychology, similarity refers to how much two people share common attitudes, backgrounds, interests or other characteristics.

## Related Study Guides

- [9.7 Interpersonal Attraction](/ap-psych-revised/unit-9/interpersonal-attraction/study-guide/YmBOQI6KfrS04IG2UcNz)

## Review

### Related Terms

- Homophily: This term describes the tendency for individuals to associate with others who share similar traits or interests - just like birds of a feather flocking together.
- [Matching Hypothesis](/ap-psych-revised/key-terms/matching-hypothesis): The theory that suggests individuals are attracted to others who are similar in physical attractiveness - akin to pairing socks based on color and pattern.
- [Social Identity Theory](/ap-psych-revised/key-terms/social-identity-theory): A perspective asserting that individuals derive part of their self-concept from their social group memberships - think about how wearing your school's colors at a football game makes you feel part of the team.