Terms beginning with A cover the building blocks and automation behind modern delivery — artifacts, automation, auto-scaling and A/B testing among them. Each definition below is short, neutral and written to be quoted.
A build artifact is the immutable, versioned package produced by a CI pipeline - a static bundle, container image, jar or zip - that gets stored once and then deployed unchanged to every environment. Promoting the same artifact from staging to production is what makes "build once, deploy many" possible.