cyclic vs periodical

cyclic

adj
  • Characterized by, or moving in cycles, or happening at regular intervals. 

  • Firing at its full cyclic rate. 

  • Having chains of atoms arranged in a ring. 

  • Having parts arranged in a whorl. 

  • Being generated by only one element. 

  • Able to be inscribed in a circle. 

noun
  • The flight control used to control a helicopter's direction and rate of horizontal movement by tilting the lift vector of the helicopter's main rotor disk. 

periodical

adj
  • Periodic. 

  • Published at regular intervals of more than one day, especially weekly, monthly, or quarterly. 

  • Of, or relating to such a publication. 

noun
  • A regularly issued thematic publication that contains the most current information in its field, often the primary means for communication of original scholarship or creative work at the cutting edge of research in its field. 

  • A publication issued regularly, but less frequently than daily. 

How often have the words cyclic and periodical occurred in a corpus of books? (source: Google Ngram Viewer )