An expanse of land with relatively low relief. (noun)
A plane. (noun)
To plane or level; to make plain or even on the surface. (verb)
To make plain or manifest; to explain. (verb)
To lament, bewail. (verb)
Examples of word plain
I do for a plain one, therefore I like the _plain ones best_, and I hope that our "good brother Burch's" prophecy, that "the days of 'fancy locomotives' will return," will never be fulfilled until after I go out of the business.
They live what they call plain lives, of course, as you well know, not using electricity.
WOODRUFF: And just as important, he is hoping to win over you, the voters in the United States, with what he calls plain-spoken words about his priorities.
Throughout the episode, however, Robison expressed difficulty understanding why he should be penalized for preaching what he called the plain message of the Bible: "I did not attack an individual or any group, but rather a life-style condemned by the Bible."
Possibly, you don't give other people credit for unselfish motives; you are too suspicious; and what you call plain talk may seem impertinence to others -- don't you think?