Look up viscosity in Wiktionary, the free dictionary.

Viscosity is the measure of the resistance of a fluid to deform under either shear stress or extensional stress. It is commonly perceived as "thickness", or resistance to pouring.

It can also refer to the following:

• Viscosity (programming) - a concept in object oriented programming, which refers to the ease at which a developer can add design-preserving code to a system.
• Viscosity (software) - an out-of-print image and animation editing utility published by Sonic Foundry.

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