An activity or event in aid of a particular cause or charity is intended to raise money for that cause or charity. a charity performance in aid of Great Ormond Street Children's Hospital
If something aids a process, it makes it easier or more likely to happen. The export sector will aid the economic recovery Calcium may aid in the prevention of colon cancer. see also Band-Aid, first aid, hearing aid, legal aid
To aid someone means to help or assist them. a software system to aid managers in advanced decision-making The hunt for her killer will continue, with police aided by the army and air force. = help, assist Aid is also a noun. He was forced to turn for aid to his former enemy. = assistance
A historical subsidy granted to the crown by Parliament for an extraodinary purpose; also, an exchequer loan
To support, either by furnishing strength or means in coöperation to effect a purpose, or to prevent or to remove evil; to help; to assist