How to say "initial, original" in Russian?

Первоначальный

"initial, original" is Первоначальный in Russian.

Первоначальный means "initial, original" in English.

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Word #3505 of 4,000 by frequency in Russian — level B2.

Example

Первоначальный план пришлось изменить из-за погоды.

The initial plan had to be changed because of the weather.