Noise is best defined as unintended or accidental sound rather than aperiodic sound

Evidence

The word noise has a lot of baggage attached to it, and often implies annoying sounds, not just any incidental sound. One broader definition might be unintended or accidental sound. Although a lot of noise is aperiodic, a power line humming at 100 Hz in the wind is also classified as noise. — Eric J. Heller, Why You Hear What You Hear- An…, 1275

Categorization

• DEFINE: Sketches a functional definition of noise as unintended sound, noting periodic hums still count.
• XREF: connects to: Noise is best defined contextually as any sound that obstructs intended communication — Almo Farina, Soundscape Ecology: Principles,…, 1241