ARC: a word coined from the initial letters of affinity, reality and communication which together equate to understanding. It is pronounced by stating its letters, A-R-C.
affinity: the degree of liking or affection or lack of it. It is the feeling of love or liking for something or someone.
reality: that which appears to be. Reality is fundamentally agreement — what we agree to be real is real.
communication: the interchange of ideas across space. Its fullest definition is the consideration and action of impelling an impulse or particle from source-point across a distance to receipt-point, with the intention of bringing into being at the receipt-point a duplication and understanding of that which emanated from the source-point.
ARC Triangle: a triangle which is a symbol of the fact that affinity, reality and communication act together as a whole entity and that one of them cannot be considered unless the other two are also taken into account. Without affinity there is no reality or communication. Without reality or some agreement, affinity and communication are absent. Without communication there can be no affinity or reality. It is only necessary to improve one corner of this very valuable triangle in Scientology in order to improve the remaining two corners.
ARC break: a sudden drop or cutting of affinity, reality or communication with someone or something. Upsets with people or things (ARC breaks) come about because of a lessening or sundering of affinity, reality or communication or understanding. Scientologists usually use the term ARC break instead of upset, because if one discovers which of the three points of understanding have been cut, one can bring about a rapid recovery in the person’s state of mind.