فَدًى

and ↓ فِدًى and ↓ فِدَاءٌ and ↓ فِدْيَةٌ all signify the same, (S, K,) i. e. [A ransom;] a thing, (K, TA,) or a captive, (TA,) that is given for a man, who is therewith liberated: (K, TA:) [the first three are also inf. ns. (and have been mentioned as such in the first paragraph); therefore when you say فَدًى لَكَ أَبِى and فِدًى لك ابى, the words فَدًى and فِدًى may be either inf. ns. or substs.: as substs., the second and third are more common than the first:] فِدْيَةً [is also sometimes explained as a verbal noun, but according to general usage] signifies as above; (K, TA;) or property given as a substitute [or a ransom] for a captive: (Mgh, Msb, TA:) and property by the giving of which one preserves himself from evil in the case of a religious act in which he has fallen short of what was incumbent, like the expiation for the breaking of an oath and of a fast; and thus it is used in the Qur'an, 2:180 and 192: (Er-Rághib, TA:) and its plural is فِدًى and فِدَيَاتٌ. (Mgh, Msb, TA.)