noun

• (heading, physical) To do with shape.
  "Study gives strength to the mind; conversation, grace: the first apt to give stiffness, the other suppleness: one gives substance and form to the statue, the other polishes it."
• (heading, physical) To do with shape.
• (heading, physical) To do with shape.
• (heading, physical) To do with shape.

verb

• (transitive) To assume (a certain shape or visible structure).
  "When you kids form a straight line I'll hand out the lollies."
• (transitive) To give (a shape or visible structure) to a thing or person.
  "Roll out the dough to form a thin sheet."
• (intransitive) To take shape.
  "When icicles start to form on the eaves you know the roads will be icy."
• (transitive, linguistics) To create (a word) by inflection or derivation.
  "By adding "-ness", you can form a noun from an adjective."