main idea

noun

plural main ideas

1

: an important or fundamental idea : central idea:

a

: a crucially important fact, theory, assertion, or opinion in something presented for consideration (such as an essay, work of art, or philosophy)

He critically examines the main ideas and arguments that have been offered on each side.

—Kent Bach

sometimes, specifically : the single idea in an essay, composition, speech, etc. that all other elements are meant to support or explain

… these students struggle to identify the main idea of a story as well as basic literary elements.

—Alex Baumhardt

b

: a primary goal or intention

Stewardship is the main idea that animates such older mainstream conservation groups …

—Daniel B. Botkin

Almost any garden effect can be achieved using xeriscape strategies. The main idea is to use plants appropriate for San Diego's semiarid climate.

—Helen Stone

2

: a center of focus or attention

In most American lasagnas, the meat is merely an afterthought. … In an authentic lasagna Bolognese, however, meat is the main idea. Three kinds of meat, in fact: beef, pork, and veal simmered until tender and delicately sweet in a slowly reducing sauce of milk, wine, and tomatoes.

—Sean Lawler

Word History

First Known Use

1699, in the meaning defined at sense 1