a flat surface on which a straight line joining any two points on it would wholly lie

the horizontal plane

a level of existence, thought, or development

everything is connected on the spiritual plane

completely level or flat

a plane surface

(of a bird or an airborne object) soar without moving the wings; glide

seagulls swooped and planed overhead

an aeroplane

a plane crash

travel in an aeroplane

I had planed into the large air terminal at Los Angeles

a tool consisting of a block with a projecting steel blade, used to smooth a wooden or other surface by paring shavings from it

smooth (wood or other material) with a plane

plane the edges of the wood to a smooth finish

a tall spreading tree of the northern hemisphere, with maple-like leaves and bark that peels in uneven patches