1.a fact or assertion offered as evidence that something is true;
it was a strong argument that his hypothesis was true
2.a contentious speech act; a dispute where there is strong disagreement;
they were involved in a violent argument
3.a discussion in which reasons are advanced for and against some proposition or proposal;
the argument over foreign aid goes on and on
4.a summary of the subject or plot of a literary work or play or movie;
the editor added the argument to the poem
5.a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable