مَعْسَاةٌ

is from عَسَى, like مَيءِنَّةٌ from إِنَّ: you say, هُوَ مَعْسَاةٌ لِلْخَيْرِ, meaning He is a person (مَحَلٌّ) [fit, or proper,] for one's saying of him, عَسَى أَنْ يَفْعَلَ خَيْرًا [It may be that he will do good]: (A and TA in article ان:) and إِنَّهُ لَمَعْسَاةٌ بِكَذَا, meaning مَخْلَقَةٌ [i. e. Verily he is adapted or disposed by nature, apt, meet, suited, &c., for such a thing]: (K, TA:) and in like manner, without variation, it is used in speaking of a female, and of two persons, and of a plural number. (TA.)