Manifold means many and various, or existing in many forms or types. When a scientist describes the manifold uses of electricity, she's pointing out how electricity powers lights, heats homes, runs computers, charges phones, and does countless other jobs. When a teacher mentions the manifold benefits of reading, he means reading helps you in multiple ways: it builds vocabulary, sparks imagination, teaches empathy, and expands knowledge.

The word suggests both quantity and diversity. A problem might have manifold causes, meaning many different factors contributed to it. A successful business might have manifold strengths, from great products to excellent customer service to smart leadership.

Manifold often appears in formal or academic writing, so you're more likely to encounter it in science articles or history books than in casual conversation. When someone uses this word, they're emphasizing both quantity and variety, like describing how a forest provides manifold benefits: oxygen production, animal habitats, flood prevention, recreation opportunities, and wood for building.

As a noun, manifold can also mean a pipe or chamber that collects or distributes something, like air or fuel in an engine.

In mathematics and engineering, a manifold has a specific technical meaning related to shapes and spaces, but in everyday usage, it simply means “many and diverse.”