• Surgical suture, to describe stitches and other techniques for holding tissues together.
• Geology
  Suture (geology)
  In structural geology, a suture is a major fault zone through an orogen or mountain range. Sutures separate terranes, tectonic units that have different plate tectonic, metamorphic and paleogeographic histories...
  
  , to describe a certain type of boundary between layers of rock.

A suture is a type of fibrous joint

Fibrous joint

Fibrous joints are connected by dense connective tissue, consisting mainly of collagen.-Types:These joints are also called "fixed" or "immoveable" joints, because they do not move. These joints have no joint cavity and are connected via fibrous connective tissue. The skull bones are connected by...

 which only occurs in the skull (or "cranium"). They are bound together by Sharpey's fibres

Sharpey's fibres

Sharpey's fibres are a matrix of connective tissue consisting of bundles of strong collagenous fibres connecting periosteum to bone...

. A tiny amount of movement is permitted at sutures, which contributes to the compliance and elasticity

Elasticity (physics)

In physics, elasticity is the physical property of a material that returns to its original shape after the stress that made it deform or distort is removed. The relative amount of deformation is called the strain....

 of the skull.

These joints are synarthroses.

It is normal for many of the bones of the skull to remain unfused at birth.