primary source

American  

[prahym-er-ee sawrs, sohrs] / ˈpraɪm ɛr i ˈsɔrs, ˈsoʊrs /

noun

1. a first-hand or original account.

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Example Sentences

Today, wind is the primary source of electricity generation in the U.K., contributing roughly a third of the country’s total supply.

From The Wall Street Journal

“Being a primary source in the sharing of that history — my history — and giving shape to a new national park has been exciting and fulfilling,” Soskin said in a statement the year she retired.

From Los Angeles Times

For the majority of people, wages and salaries remain the primary source of income.

From Science Daily

“No country in the Western Hemisphere has ever suffered a blockade that shuts off its primary source of export revenue,” said Francisco Rodriguez, a Venezuelan economist at the University of Denver.

From The Wall Street Journal

As many as 28% of Gen X workers expect Social Security to be their primary source of income, according to TCRS.

From MarketWatch