noun

• (uncountable) Help; assistance; succor, relief.
  "He came to my aid when I was foundering."
• (countable) A helper; an assistant.
  "It is not good that man should bee alone, let vs make vnto him an aide like to himselfe."
• (countable) Something which helps; a material source of help.
  "Slimming aids include dietary supplements and appetite suppressants."
• (countable, British) An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort.
  "In this parliament was granted to the king for defence against the Scots two aids and two quindecims, the which two aids did not extend over two quindecims."

verb

• (transitive) To provide support to; to further the progress of; to help; to assist.
  "You speedy helpers […] Appear and aid me in this enterprise."
• (climbing) To climb with the use of aids such as pitons.
  "Rather than climb into a bottomless off-width crack, we aided an 80-foot A2 to A3 crack to the top of a pedestal. By very tenuous face climbing, we gained entry to the crack, which we followed to a tree beneath the big chimney."