Repeating like clockwork or repeated periods

adjective

1. Of, relating to, or being a cycle
2. Moving in cycles

   "cyclic time"

3. Of, relating to, or being a chemical compound containing a ring of atoms
4. Being a mathematical group that has an element such that every element of the group can be expressed as one of its powers

noun

1. A helicopter control that governs horizontal thrust by adjusting the pitch of individual rotor blades during their rotation

noun

1. A cyclic mononucleotide of adenosine that is formed from ATP and is responsible for the intracellular mediation of hormonal effects on various cellular processes

noun

1. A cyclic mononucleotide of guanosine that acts similarly to cyclic AMP as a secondary messenger in response to hormones