What does ides mean in the play of Julius Caesar?

In the context of the play 'Julius Caesar', the term 'ides' refers to a specific date within a Roman month. In the story, a soothsayer warns Julius Caesar to "beware of the ides of March". The ides of March is the 15th of March in the Roman calendar. It is significant in the play as it is the date on which Caesar is assassinated by a group of conspirators led by Marcus Brutus and Gaius Cassius Longinus. The soothsayer's warning becomes a crucial plot element as it foreshadows Caesar's impending demise.