| -ity     -ای، -ایگی     -i (#), -igi (#) 
 Fr.: -ité    A suffix used to form abstract nouns expressing state, degree, or condition: metallicity, 
luminosity, periodicity, Gaussianity. From M.E. -ite, from O.Fr. -ité, from L. -itas (-itat-), from 
-i- (thematic or, rarely, connective vowel) + -tas (-tat-), 
may be cognate with Av./Skt. -tāt  (as in Av. uparatāt, 
Skt. uparátāt "supremacy," Av. haurvatāt, 
Skt. sarvátāt "completeness"). The suffix -igi, from -ig adj. suffix, variant of -ik,  
→ -ic, + -i  noun suffix. 
 Note: The Pers. suffix -i forms state/condition nouns from adjectives, as in: 
xubi, zešti, râsti, âzâdi, tanhâyi. There is though a phonetic problem 
when the adj. ends in -i, since two successive i's are not 
easily articulable, e.g.: felez "metal," felezi "metallic," *felezii 
"metallicity."  Mid.Pers. did not have this problem, since the adj. suffix 
was -îg or -îk 
(instead of -i) and the noun suffix -îh (instead of -i). Some examples 
in Mid.Pers.:  
tuhîg "empty," tuhîgîh "emptiness," tuwânîg "able," 
 tuwânîgîh "ability," spurrîg "complete,"  spurrîgîh 
"completeness, perfection," nazdîk "near," nazdîkîh "proximity." 
A way out of this phonetic problem is to use the Mid.Pers. -igi. 
This solution, first introduced in the case of  tohi, tohigi 
(→ void), was generalized by 
M. Sch. Adib-Soltâni (Irânigi, Âlmânigi, darunâxtigi, borunâxtigi, etc.). 
This seems a natural solution 
since the adj. suffix -i is the evolution of the Mid.Pers. -ig, and  
moreover Pers. currently revives the g phoneme in comparable phonetic situations, 
as in  the ending phoneme  -é (-eh), which derives from Mid.Pers. -ag. 
A number of examples:  adj. âzâdé, n. âzâdegi; adj. tâbandé, n. 
tâbandegi; adj. mardâné, n. mardânegi; likewise xâné, xânegi, 
setâré, setâregân; âzâdé, âzâdegân.  
Interestingly, the -igi suffix has this specified function in some dialects, 
for example (Tajik, Šahrezâ-yi) xâligi "emptiness," from xâli.
 Some examples for the use of -igi in this work:
felezigi, → metallicity;  
mâddigi,  → materiality; beyzigi,  
→ ellipcity, tâštigi, 
→ certainty, etc.
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