Hard
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Reverted edits by [[Special:Contributions/12.175.158.186|12.175.158.186]] to last version by GeorgeMillo (using [[WP:HG|Huggle]])
{{wiktionarypar|hard|hardness}}
'''Hard''' or '''Hardness''' may refer to:
* [[Hardness]], resistance of physical materials to change under force.
* [[Hard water]] has a high mineral content.
* Mathematical difficulty; see [[computational complexity theory]].
* A [[difficulty level]] in a [[video game]].
* [[Street hardness]], an attribute characterized by physical and mental toughness due to living in hostile urban environments.
* [[Hard, Austria]], a town in [[Austria]].
* Slang for erection of the penis when sexually excited or aroused. See [[Erection]]
* [[Hard]], When you do something very strongly; with a lot of emphasis
* [[Hard (Brainpower album)|Hard]], a music album by [[Brainpower]]
* [[Hard (Gang of Four album)|Hard]], an album by [[Gang of Four (band)|Gang of Four]]
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[[cs:Tvrdost]]
[[de:Hard (Begriffsklärung)]]
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[[no:Hardhet]]
[[pl:Twardość]]