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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.
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- in Indo-European roots. N., sense 4, short for aeroplane.]
1. A carpenter's tool with an adjustable blade for smoothing and leveling wood.
2. A trowel-shaped tool for smoothing the surface of clay, sand, or plaster in a mold.
v. planed, plan·ing, planes
1. To smooth or finish with a plane: planed the door.
2. To remove with a plane: plane off the rough edges on a board.
To work with a plane.
[Middle English, from Old French, from Late Latin plāna, from plānāre, to plane, from plānus, flat; see pelə- in Indo-European roots.]
intr.v. planed, plan·ing, planes
1. To rise partly out of the water, as a hydroplane does at high speeds.
2. To soar or glide.
3. To travel by airplane.
[Middle English planen, to glide, soar, from Old French planer, from plain, flat, level; see plain.]
The plane tree.
[Middle English, from Old French, from Latin platanus, from Greek platanos, perhaps from platus, broad; see plat- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.