The attainment of arahatship otherwise known as 4th Path in the Theravada Four Path Model, is considered by some to the end of the specific axis of development related to the Third Training, that of Wisdom.
Various other spellings of Arahat include Arhat and Arahant. It may be translated variously as Saint or Conquerer.
There is much controversy regarding the criteria for what an arahat is and how the word should be used, as well as whether or not it marks the end of the training in Wisdom.
The standard dogma of arahatship is that the arahat is free from the following Ten Defilements: 1) Personality Belief 2) Attachment to Rites and Rituals 3) Skeptical Doubt 4) Lust 5) Hatred 6) Attachment to the Formed Realms 7) Attachment to the Formless Realms 8) Restlessness and Worry 9) Conceit 10) The Last Veil of Unknowing
See those sub-headings for thoughts on the verifiable truths behind each of those.
In general, most of the standard dogma is bound up in an odd mix of truth and idealism.
Correlations with other maps are also controversial, and it may by some be considered equivalent to the Tenth Bhumi of the Tibetan Bhumi System, and possibly to Satori or perhaps Kensho of Zen, though there is also controversy about how those words are used.
The way the term arahat tends to be used on the DhO is as follows: