plane 1 
(plān)
(plān)n.
1. Mathematics A surface containing all the straight lines that connect any two points on it.
2. A flat or level surface.
3. A level of development, existence, or achievement: scholarship on a high plane.
4. An airplane or hydroplane.
5. A supporting surface of an airplane; an airfoil or wing.
adj.
1. Mathematics Of or being a figure lying in a plane: a plane curve.
2. Flat; level. See Synonyms at level.
[Latin plānum, flat surface, from neuter of plānus, flat; see pelə-2 in the Appendix of Indo-European roots. N., sense 4, short for AEROPLANE.]
planeness n.
- Indo-European root: uks-en-
- Indo-European root: uper
- Indo-European root: upo
- Indo-European root: wal-
- Indo-European root: wap-
- Indo-European root: we-
- Indo-European root: webh-
- Indo-European root: wed-
- Indo-European root: wed-
- Indo-European root: weg-
- Indo-European root: wegh-
- Indo-European root: wei-
- Indo-European root: weid-
- Indo-European root: weik-
- Indo-European root: weik-
- Indo-European root: weik-
- Indo-European root: weip-
- Indo-European root: weiə-
- Indo-European root: wekti-
- Indo-European root: wekw-
- Indo-European root: wel-
- Indo-European root: wel-
- Indo-European root: welə-
- Indo-European root: wemə-
- Indo-European root: wen-