Artefact or artifact?

noun UK standard spelling of artifact

noun USAn object made or shaped by human hand or labor

noun USAn object made or shaped by some agent or intelligence, not necessarily of direct human origin

noun USSomething viewed as a product of human agency or conception rather than an inherent element

noun USA finding or structure in an experiment or investigation that is not a true feature of the object under observation, but is a result of external action, the test arrangement, or an experimental error

The spot on his lung turned out to be an artifact of the X-ray process

noun USAn appearance or structure in protoplasm due to death, the method of preparation of specimens, or the use of reagents, and not present during life

noun USA perceptible distortion that appears in an audio or video file or an image as a result of applying a lossy compression or other inexact processing algorithm or of physical interference in an…

This JPEG image has been so highly compressed that it has unsightly artifacts, making it unsuitable for the cover of our magazine

noun USAn object, such as a tool, ornament, or weapon of archaeological or historical interest, especially such an object found at an archaeological excavation

The dig produced many Roman artifacts

noun USA powerful weapon, armor or another object, often with magical properties