Definition

Relating to biological processes that happen in cycles of about 24 hours, such as sleep and wakefulness.

Example

Many animals have circadian rhythms that help them know when to sleep and when to be active.

Conversation

Have you ever heard about how our bodies follow a circadian rhythm?

Yeah, I read that it affects our sleep patterns and energy levels.

Exactly! It's fascinating how our circadian cycles can influence our daily lives.

Totally! I've been trying to align my schedule with it for better sleep.

Synonyms & Antonyms

Root Explanation

Circadian is formed from "circa" (meaning around) and "diem" (meaning day). The term refers to biological processes that cycle around a 24-hour day.

Memory Tip

Think of processes that happen 'around' ('circa') a 'day' ('diem') — that's why circadian refers to daily cycles.

Visually Confused Words