Plato's Euthyphro and the Philosophical definition

While the literary problem of Plato's *Euthyphro* addresses the question "what is piety?", the philosophical question of the dialogue is how we can attain to an adequate definition of anything so as to ascertain the right action in any given circumstance? The dialogue presents six definitions of the "holy" (piety), through which we discover the three main features of a philosophical definition:

1) That the definition should make clear to what things it is prescribed;

2) That the definition should not include its opposite;

3) That the definition correspond to a singular reality (form) that is distinct (intelligible and communicable) from other things.