Perpetual (adjective)

1. Lasting forever or for an indefinitely long time.
2. Continuing without interruption or ceasing.
3. Constant or ongoing.
4. Never ending or changing.
5. Occurring repeatedly or constantly.

Origin:

Late middle english: from latin perpetualis, from perpetuus "continuous, lasting forever", from per- "through" + petere "go, seek".

Examples:

1. The sun gives us perpetual light and heat, day after day, year after year.
2. The company aims to provide its customers with perpetual and seamless service, 24/7.
3. The artist created a perpetual motion machine that keeps running indefinitely, powered by its own movement.
4. The city is famous for its perpetual festivals and events, which attract visitors from all over the world.
5. The love they share is perpetual, never diminishing or fading with time.