Transition

Transition may refer to:

- an atomic component of a rulestring, such as the outer-totalistic "B3" or the isotropic "S4j" -- specifying the state of a key cell and its neighbors, along with the future state of the key cell

- one line from a transition table or similar CA rule definition

- a shortened form of transition rule

- an ordered pair (current cellstate, new cellstate). There are n^2 possible transitions in a n-state rule. If one requires the two cellstates to be different, like in the dictionary definition for 'transition', there are n^2-n such ordered pairs.