To continue reading this content, please enable JavaScript in your browser settings and refresh this page. For generations, the Monongahela River Valley was the ...

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Valley, elongate depression of the Earth’s surface. Valleys are most commonly drained by rivers and may occur in a relatively flat plain or between ranges of hills or mountains.

The meaning of ESSENTIAL is of, relating to, or constituting essence. How to use essential in a sentence. Synonym Discussion of Essential.

ESSENTIAL meaning: 1. necessary or needed: 2. relating to something's or someone's basic or most important qualities…. Learn more.

ESSENTIAL definition: absolutely necessary; indispensable. See examples of essential used in a sentence.

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Explore the definition of the word "essential," as well as its versatile usage, synonyms, examples, etymology, and more.

Discover everything about the word "ESSENTIAL" in English: meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide.

essential: Constituting or being part of the nature or essence of something; inherent.

Definition of essential. English dictionary and integrated thesaurus for learners, writers, teachers, and students with advanced, intermediate, and beginner levels.

The meaning of UNDERSTANDING is a mental grasp : comprehension —usually used with of. How to use understanding in a sentence.

Understanding is a cognitive process related to an abstract or physical object, such as a person, situation, or message whereby one is able to use concepts to model that object.