| Keyword | Definition | 
|---|
| boolean expression | a question with an answer of either true or false | 
| boolean value | either true or false | 
| condition | an expression that will be evaluated as either true or false | 
| evaluate | replacing variables with their values and performing all operations necessary until you're left with a single value | 
| expression | values and or variables combined using operators or functions | 
| function | named section of code which processes an input and returns an output. e.g. average(1,2,3) is a function which returns the average value (2) of the input (1, 2 and 3) | 
| operator | a symbol that performs an operation such as + (add) or - (subtract) |