able vs decidable

able

adj
  • Legally qualified or competent. 

  • Gifted with skill, intelligence, knowledge, or competence. 

  • Having the necessary powers or the needed resources to accomplish a task. 

  • Free from constraints preventing completion of task; permitted to; not prevented from. 

  • Capable of performing all the requisite duties; as an able seaman. 

noun
  • The letter "A" in Navy Phonetic Alphabet. 

decidable

adj
  • capable of being decided. 

  • in intuitionistic logic, a proposition P is decidable in a given theory if it can be proven from the theory that "either P or not P", i.e. in symbols: P∨¬P. 

  • describing a set for which there exists an algorithm that will determine whether any element is or is not within the set in a finite amount of time. 

How often have the words able and decidable occurred in a corpus of books? (source: Google Ngram Viewer )