I'm looking for a single-word adjective which means 'satisfies the given conditions'. For example, the condition might be, "Your number must be less than 10." Here the number 2 would be a _____ number. This is specifically in a mathematical context so the surrounding language is somewhat formal.

I thought of satisfactory (but it sounds like I'm still not happy with the choice), suitable (I've used this word once already so I don't want to repeat it), and fitting (doesn't really... fit).

  • A remark: rather than "Here the number 2 would be a (valid) number", you would rather write "Here the number 2 would be a (valid) choice". The "number" in itself bears no validity, it is the fact of choosing it for a particular purpose that has. You'll find that with this formulation, many more synonyms of "valid" will be... valid. – Joce Mar 24 '16 at 8:43

Valid. You are applying a validation rule to the supplied candidate; if it passes the test it is valid, if not, it is invalid

appropriate to the end in view (Merriam-Webster)


Compliant or consistent or qualifying or requisite



  • appropriate or suited for some purpose: in its proper place.




applying or capable of being applied; relevant; suitable; appropriate: an applicable rule; a solution that is applicable to the problem.

Source: dictionary.com

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