-ity

(Latin: suffix used to form abstract nouns expressing act, state, quality, property, or condition corresponding to an adjective)

homogeneity
Similar throughout; of uniform structure or composition.
homozygosity (s) (noun), homozygosities (pl)
The state of possessing a pair of identical alleles at a given locus: In the different study groups no homozygosity was discovered.

Homozygosity has two identical genes at the corresponding loci of homologous chromosomes.

humanity
1. Human beings as a group.
2. The quality, condition, or fact of being human; humanness.
hyperacuity (s) (noun), hyperacuities (pl)
The increased sharpness of sense perceptions: When Anita went to the ophthalmologist's office for a regular check-up, she was diagnosed as having hyperacuity, which was better than twenty-twenty vision!
hyperadiposis (s) (noun) (no pl)
An extreme degree of fatness; morbid obesity; lipomatosis: If someone is severely overweight, he or she suffers from hyperadiposis exemplified by an extreme accumulation of body fat or an unusual degree of adiposis.
hypoacidity (s) (noun), hypoacidities (pl)
Deficiency of normal acidity: Hypoacidity is a condition of having an insufficient amount of acidity in the gastric juice of a person's stomach.
hypoacuity (s) (noun), hypoacuities (pl)
Decreased sharpness of sense perception: Since Jane noticed a change in her hearing, she decided to go to the otorhinolaryngologist for a checkup and found out that she couldn't hear as well as before, and he diagnosed her condition as being a case of hypoacuity.
idiomaticity
The quality or state of being idiomatic.
inability (s) (noun), inabilities (pl)
1. A lack of capacity or means to do something: Grandmother was blind and therefore had the inability to see.
2. Absence of enough power, capacity or resources: Although Tim had been in school for many years, he still had the inability to read up to grade level.
inalterable (adjective), more inalterable, most inalterable
Relating to anything that is not possible to change or to modify: History is inalterable since it has already passed and cannot be replaced or remodelled!

The death of an individual is an inalterable fact that cannot be reversed.

incredulity
1. A disbelieving frame of mind; unreadiness or unwillingness to believe (statements, etc.); disbelief.
2. A state or feeling of disbelief.

There are two ways to slide easily through life; to believe everything or to doubt everything; both ways save us from thinking.

—Alfred Korzybski
inequilibrium (s) (noun), inequilibriums, inequilibria (pl)
That which is unbalanced because of opposing forces being uneven.
infecundity (s) (noun), infecundities (pl)
An unfruitfulness; barrenness; a female sterility.
infinity (s) (noun), infinities (pl)
1. Unlimited space, time, distance, quantity, etc.; extending beyond any measure or comprehension; without beginning or end; endless: Beyond the Earth we find infinity.
2. Very great; vast; immense: such as, space or time: Outer space provides an infinity of stars.
3. In mathematics, the concept of being unlimited by always being larger than any imposed value or boundary: Infinity exists beyond or is greater than any arbitrarily large value.
4. In photography, a distance setting, as on a camera, beyond which the entire field is in focus: Shirley set the lens on her camera to infinity so objects at a distance would be in focus.
inhumanity
1. Lack of pity or compassion.
2. An inhuman or cruel act.