The word "Right" is used as shorthand for:

Being in accord with one's sense of being part of the interdependent web of life and in accordance with one's own individual conscience. A yin/yang concept, if you will.

Right Speech would be speaking within an awareness that we are all part of the interdependent web of life and with the guidelines of one's conscience to speak with truth and compassion. In a way that forwards all of our efforts to make the world a better place and be true to ourselves as part of that world.

Instead of all that wording, the translation used is "Right", to encompass both ourselves as part of the community and ourselves as individuals doing the best we can to be authentic, loving, honest people.

You see why a shorthand word is needed. Can you imagine trying to list each one with a full explanation? On the flip side, if a short word or phrase is used, it invites the individual to meditate on its meaning, futhering his way along the Path.