جَيْرِ

, with kesr to the ر, (S, Mughnee, K, &c.,) like أَمْسِ; (Mughnee;) and جَيْرَ, like أَيْنَ; and sometimes جَيْرٍ; (Mughnee, K;) or this, where it occurs, is for جَيْرِ إِنَّ, and is properly written جَيْرِنْ, إِنَّ in the sense of نَعَمْ being a corroborative of جَيْرِ, and its hemzeh and sheddeh and final vowel being here suppressed: (Mughnee:) a form of oath, (S, K,) or put in the place of an oath, (IAmb, TA,) meaning Verily, or truly; synonym حَقًّا: (S, K:) or a responsive particle, (Mughnee,) meaning yes; synonym نَعَمْ [which is most approved as responsive to an interrogation], (Mughnee, K,) or أَجَلْ [which is most approved as responsive to an affirmation]; (Sharh et-Tesheel, K;) not a noun in the sense of حَقًّا, for were it so it would be a verbal noun; nor in the sense of أَبَدًا, for were it so it would be an adv. n. of time; and if it were a noun it would be decl., and would admit the article ال, and would not have إِنَّ for a corroborative, nor have لَا opposed to it, as it has in the saying,

إِذَا تَقُولُ لَا ابْنَةُ العُجَيْرِ

تَصْدُقُ لَا إِذَا تَقُولُ جَيْرِ

[When the daughter of El-'Ojeyr says لا, she speaks truly: not when she says جير]: (Mughnee:) or it is a verbal noun, meaning I know; synonym أَعْرِفُ; as is mentioned by Ibn-Abi-r-Rabeea, and by Er-Radee on the authority of 'Abd-El- Káhir. (MF.) You say, جَيْرِ لَا اتِيكَ Verily, or truly, [&c.,] I will not come to thee. (S.) And جَيْرِ لَا أَفْعَلُ ذٰلِكَ Verily, or truly, [&c.,] I will not do that. (K, * TA.) And لَا جَيْرِ لَا أَفْعَلُ No, verily, or truly, [&c.,] I will not do [that]. (K.)