In a very close one-on-one situation.

Direct, one-to-one.

Facing one another. / Directly, one-to-one.

Alternative form of head-on.

Alternative form of head-on.

Used to create nouns indicating a state; -hood.

(sometimes derogatory) Used to form words for people who regularly have their mind focused upon a particular subject, activity, or a specified drug or other substance, or who are addicted in some way.

Of, relating to, or intended for the head.

(transitive) To be in command of. (See also head up.) / (transitive) To come at the beginning or front of; to commence. / (transitive) To strike with the head; as in soccer, to head the ball

Foremost in rank or importance. / Placed at the top or the front. / Coming from in front.