And/or

Means “or”, because “or” includes “and”.

• “And” is a logical operator which gives the value one if and only if all the operands are one, and otherwise has a value of zero.
  
• “Or” is a logical operation which gives the value one if at least one operand has the value one, and otherwise gives a value of zero.

It's utterly defeatist drafting, because of the presence of that slash: what does it even mean? That slash admits that the plain, punctuated words of the English language have defeated you.

In fact, that slash means - and can only mean - “or”. So by saying "and or" you are really saying "and, or or". But to be hermetically sealed and consistent, shouldn't you go the whole hog, and say "and, and/or or"?

AND DO YOU NOW SEE THE INFINITE REGRESSION YOU HAVE SET IN MOTION?

Never speak of this again.