Etymology
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frontal (adj.)

"being in front," 1650s, of the forehead; 1971 with reference to the naked standing body; from Modern Latin frontalis, from front-, stem of Latin frons "brow, forehead" (see front (n.)). In some uses probably from front (n.) + adjectival suffix -al (1).

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Definitions of frontal
1
frontal (adj.)
belonging to the front part;
a frontal appendage
frontal (adj.)
of or relating to the front of an advancing mass of air;
frontal rainfall
frontal (adj.)
meeting front to front;
a frontal attack
Synonyms: head-on
frontal (adj.)
of or adjacent to the forehead or frontal bone;
the frontal lobes
2
frontal (n.)
an adornment worn on the forehead;
Synonyms: frontlet
frontal (n.)
a drapery that covers the front of an altar;
frontal (n.)
the face or front of a building;
Synonyms: facade / frontage
From wordnet.princeton.edu