horizontal
Horizontal; running parallel to the horizon or a flat surface. The opposite of vertical.
Bitte ziehen Sie eine horizontale Linie von links nach rechts.
Please draw a horizontal line from left to right.

Loading your saved state.
Horizontal; running parallel to the horizon or a flat surface. The opposite of vertical.
Bitte ziehen Sie eine horizontale Linie von links nach rechts.
Please draw a horizontal line from left to right.

'Horizontal' (horizontal) can also be used as an adverb without changing form. It then describes how an action is carried out: in a horizontal direction.
Der Balken muss horizontal ausgerichtet werden.
The beam must be aligned horizontally.
The literal meaning can be recognized from words in the fields of geometry, technology, or description. Typical nouns are 'Linie' (line), 'Ebene' (plane), 'Achse' (axis), or 'Position' (position).
Der Patient lag in horizontaler Position auf dem Bett.
The patient lay in a horizontal position on the bed.
The figurative meaning is found in the context of organizations and companies. It is often combined with words such as 'Struktur' (structure), 'Kommunikation' (communication), 'Hierarchie' (hierarchy), or 'Zusammenarbeit' (collaboration).
Das Unternehmen fördert die horizontale Zusammenarbeit zwischen den Abteilungen.
The company promotes horizontal collaboration between the departments.
just / exactly
'eben' and 'horizontal' can both have to do with a straight, flat position. 'eben' mainly describes a surface without unevenness, for example a floor or a table. 'horizontal' describes the direction more precisely: something runs level, that is, not upward or downward. The words can be confused because a horizontal line often lies on a flat surface. But 'eben' is more about the question: Is the surface smooth and flat? 'horizontal' is more about the question: In what direction does something run?

Zieh bitte eine horizontale Linie unter die Überschrift.
Please draw a horizontal line under the heading.
Der Tisch muss eben stehen, sonst wackelt das Glas.
The table has to stand level, otherwise the glass will wobble.