Related Clues:

• Flat
• Lacking width and depth
• Lacking depth
• Like a line, briefly
• Like a line, in math
• Linear, for short
• Linear
• Like a line segment, briefly
• Having no depth, in brief
• Linear, briefly
• Linear, unlike holographic images
• Came first
• Aced
• Like a line, for short
• Flat, for short