adj

• (archaic) White or pale; without colour.
  "To the blanc Moone / Her office they preſcrib'd,"
• (figurative) Lacking characteristics which give variety; uniform.
  "a blank desert; a blank wall; blank unconsciousness"
• (figurative) Without expression, usually because of incomprehension.
  "Failing to understand the question, he gave me a blank stare."
• (military) Of ammunition: having propellant but no bullets; unbulleted.
  "The recruits were issued blank rounds for a training exercise."

noun

• (archaic, historical, obsolete) A small French coin, originally of silver, afterwards of copper, worth 5 deniers; also a silver coin of Henry V current in the parts of France then held by the English, worth about 8 pence .
  "Whosoeuer brought a fagot before the kynges tent, he shulde haue a blanke of Fraunce."
• (obsolete) A nonplus [16th century].
• (now chiefly US) A document, paper, or form with spaces left blank to be filled in at the pleasure of the person to whom it is given (e.g. a blank charter, ballot, form, contract, etc.), or as the event may determine; a blank form .
  "[…] and the freemen signified their approbation by an inscribed vote, and their dissent by a blank."
• (now chiefly US) A document, paper, or form with spaces left blank to be filled in at the pleasure of the person to whom it is given (e.g. a blank charter, ballot, form, contract, etc.), or as the event may determine; a blank form .

verb

• (transitive) To make void; to erase.
  "I blanked out my previous entry."
• (transitive, slang) To ignore (a person) deliberately.
  "She blanked me for no reason."
• (transitive, aviation, of a control surface) To render ineffective by blanketing with turbulent airflow, such as from aircraft wake or reverse thrust.
  "At high angles of attack, the shuttle’s rudder is blanked by the fuselage and wings, forcing it to use its RCS thrusters for yaw control."
• (transitive) To prevent from scoring; for example, in a sporting event.
  "The team was blanked."

name

• (chiefly dated) Used as an anonymous placeholder for a person's name.
  "Miss Compton, in 'Other People's Worries,' asks rhetorically whether a young rip was not in the Blank divorce case."