What is the meaning of frontal?

noun

• An adornment worn on the forehead.
  • synonyms: frontlet
• A drapery that covers the front of an altar.
• The face or front of a building.
  • synonyms: facade, frontage

adjective

• Belonging to the front part.
  • usage: "a frontal appendage"
• Of or relating to the front of an advancing mass of air.
  • usage: "frontal rainfall"
• Meeting front to front.
  • usage: "a frontal attack"; "a head-on collision"
  • synonyms: head-on
• Of or adjacent to the forehead or frontal bone.
  • usage: "the frontal lobes"