An aperture is an opening, usually a small one. “If you can thread the silk through that aperture and pull it out the other side, we can knot it and create a loop.”

The most common place you’ll find aperture is when you’re talking about cameras or photography. In that case, an aperture refers specifically to the hole or opening in the lens that lets light through, which you can adjust (with the f-stop) to let in more or less light, resulting in a shallow or deep range of focus. A large aperture means only one tiny point of the photo will be in sharp focus, while a small aperture means that much of the background as well as the foreground will be in focus.

Definitions of aperture

n a natural opening in something

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the contractile aperture in the center of the iris of the eye; resembles a large black dot
minute opening in the wall of an ovule through which the pollen tube enters
pore, stoma, stomate
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
germ pore
a pore in the outer wall of a spore or pollen grain through which the germ tube or pollen tube makes its exit on germination
hydathode, water pore, water stoma
a pore that exudes water on the surface or margin of a leaf of higher plants
one of many raised pores on the stems of woody plants that allow the interchange of gas between the atmosphere and the interior tissue
Type of:
an opening into or through something

n a man-made opening; usually small

embouchure, mouthpiece
the aperture of a wind instrument into which the player blows directly
a part that goes over or into the mouth of a person
Type of:
a vacant or unobstructed space that is man-made

n a device that controls amount of light admitted

Type of:
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc.

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