basic

US /ˈbeɪ.sɪk/

UK /ˈbeɪ.sɪk/

1.

forming an essential foundation or starting point; fundamental.

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The basic principles of physics are taught in high school.

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You need to learn the basic rules before playing the game.

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fundamental essential primary core elementary

2.

simple and not elaborate or luxurious; plain.

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The hotel room was very basic, but clean.

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She prefers basic clothes without too many patterns.

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simple plain modest unadorned minimal

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basically back to basics