Conditional in a Computer Science context? Conditional in a Mathematical context? Unless, there is one in the Engish context--I can only think of subjunctive that might be deemed to have relational with the word conditional.
A conditional clause is one beginning with the word "if" and expressing the hypothetical conditions under which something might occur. (e.g. If I wake up in time, I'll be able to see the sunrise.) Is that what you meant?