Sāmāyika is the vow of periodic concentration observed by the Jains. It is one of the essential duties prescribed for both the Śrāvaka (householders) and ascetics. The preposition sam means one state of being. To become one is samaya. That, which has oneness as its object, is sāmāyikam. Sāmāyika is aimed at developing equanimity and to refrain from injury.
On the third pratimā (stage) the householder resolves to observe the sāmāyika vow three times a day.
According to the Jain text, Purushartha Siddhyupaya:
After renouncing all attachments and aversions, and adopting a sense of equanimity in all objects, one should practise, many times, periodic concentration (sāmāyika), the principal means to realize the true nature of the Self.
Sāmāyika is also one of the five kinds of conduct (cāritra) other kinds being reinitiation, purity of non-injury, slight passion and perfect conduct. It is of two kinds — with and without time limit.