What is the meaning of Plain?

Flat, level.

Simple, unaltered.

  1. Ordinary; lacking adornment or ornamentation; unembellished.

    Ordinary; lacking adornment or ornamentation; unembellished.

    Of just one colour; lacking a pattern.

    Simple in habits or qualities; unsophisticated, not exceptional, ordinary.

    Having only few ingredients, or no additional ingredients or seasonings; not elaborate, without toppings or extras.

    Containing no extended or nonprinting characters (especially in plain text).

    Obvious.

    1. Evident to one's senses or reason; manifest, clear, unmistakable.
    2. Downright; total, unmistakable (as intensifier).

      Evident to one's senses or reason; manifest, clear, unmistakable.

      Downright; total, unmistakable (as intensifier).

      Open.

      1. Honest and without deception; candid, open; blunt.

        Honest and without deception; candid, open; blunt.

        Clear; unencumbered; equal; fair.

        Not unusually beautiful; unattractive.

        Not a trump.

        Simply.

        Plainly; distinctly.

        An expanse of land with relatively low relief and few trees, especially a grassy expanse.

        A broad, flat expanse in general, as of water.

        Synonym of field in reference to a battlefield.

        Alternative spelling of plane: a flat geometric field.

        To level; to raze; to make plain or even on the surface.

        To make plain or manifest; to explain.

        A lamentation.

        To complain.

        To lament, bewail.

        Full, complete in number or extent.

        full

        full (not empty)

        full (not empty)

        plain (flat area)

        flat (not even or mountainous)

        full

        plane

        Source: wiktionary.org