The phrase "annual meteor" refers to a meteor shower that happens once every year. It is a celestial event where many meteors, also known as shooting stars, can be seen streaking across the night sky. Full definition
What is the origin of annual meteor showers, such as the Perseids? (scientificamerican.com)
No such annual meteor shower was ever reported. (sciencemag.org)
The Geminids of 8 — 17 December are widely regarded as the most active and consistent annual meteor shower, with peak predicted rates of 100 shooting stars per hour under dark skies. (astronomynow.com)