1. Definition: 1. difficulty that causes worry or emotional tension;

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1. Definition: 1. (biology) a group of organisms within a species that differ in trivial ways from similar groups;

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1. Definition: 1. (physics) a stress that produces an elongation of an elastic physical body; "the direction of maximum tension moves asymptotically toward the direction of the shear"

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1. Definition: 1. the property of lacking physical or mental strength; liability to failure under pressure or stress or strain; "his weakness increased as he became older"; "the weakness of the span was overlooked until it collapsed"

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1. Definition: 1. the act of pressing; the exertion of pressure; "he gave the button a press"; "he used pressure to stop the bleeding"; "at the pressing of a button"

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1. Definition: 1. feeling of tiredness

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