Pronunciation: (hed'on', -ôn'), [key]
1. (of two objects) meeting with the fronts or heads foremost: a head-on collision.
2. facing the direction of forward motion or alignment; frontal.
3. characterized by direct opposition: a head-on confrontation.
with the front or head foremost, esp. in a collision: She stepped out of the front door and walked head-on into her husband.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.