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'Motility' is a biological term which refers to the ability to move spontaneously and independently. It can apply to either single-celled or multicellular organisms.
In cellular biology or biomedical engineering, motility often refers to directed cell movement down gradients established in biopolymers. Examples are:

★ movement along a chemical gradient (see chemotaxis)

★ movement along a rigidity gradient (see durotaxis)

★ movement along a gradient of cell adhesion sites (see haptotaxis)