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WordNet-Online 
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| Definitions from the WebThresholdDefinition:A threshold refers to the point or level at which something begins or changes. Parts of Speech:
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| threshold level threshold operation threshold population threshold voltage thresholds threskiornis threskiornis aethiopica threskiornithidae thresshold threw thrice-a-week thrice thrie thrifht thrifless thriflessness thrift 
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