The best replacement for definitions is dictionary.

The best alternatives to definitions are rated as following:

★★★★★	dictionary
★★	glossary
★★	declarations
★★	terms
★★	site templates
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★	conceptual
★	dictionaries
	operational definitions
	vocabulary in sentences

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Speaking about definitions, one probably shouldn't forget about example sentences.

Other search terms related to definitions and their ratings are:

★★★★★	example sentences
★	context clues
★	sentence examples
★	sentences dictionary
	word

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definitions

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