Difference between a lambda term and a lambda expression Is there any difference between a $\lambda$-term and a $\lambda$-expression? 

Looking at the recursive definitions on Wikipedia of 
$\lambda$-term and $\lambda$-expression, they are equivalent. But I am confused as they are slightly different and refer to what they define by a different name.
Books on lambda calculus define only lambda terms. Some programming languages may call anonymous function lambda expressions.