-ance, -ancy

(Latin: often through French, quality or state of; being; condition; act or fact of _______ ing; a suffix that forms nouns)

importance (s) (noun) (no plural)
The quality or state of being influential, worthy of notice, or significant: The importance of developing a greater knowledge of vocabulary words cannot be over emphasized.
inacquaintance
Lacking an acquaintance; not acquainted with.
incogitance
Lacking thought.
incognizance (s) (noun), incognizances (pl)
Lacking perception or recognition: The incognizance of the laws for driving vehicles cannot be an excuse for driving too fast past a school or kindergarten.
indignance (s) (noun), indignances (pl)
An anger or scorn aroused by something felt to be unjustified or incorrect: "The witness had to accept the indignance of being told to leave the courtroom."
inductance
1. The property of an electric circuit by which an electromotive force is induced in it as the result of a changing magnetic flux.
2. A circuit element, typically a conducting coil, in which electromotive force is generated by electromagnetic induction.
3. That property of a circuit or device by virtue of which any variation in the current flowing through it induces an electromotive force in the circuit itself (self-inductance) or in another conductor (mutual inductance). Without qualification, it is usually the former.

Also, the magnitude of this, as measured by the ratio of an induced electromotive force to the rate of change of the inducing current.

inelegance
Referring to the lack of refinement and good taste.
inheritance
Lexicomedy: Will-gotten gains.
inobservance
insignificance
instance (IN stuhns) (s) (noun), instances (pl)
An example to illustrate a situation or to make a point: Polly's falling on the stairs was one more instance of the need to have safety rails.

The tax preparer cited an instance of Max forgetting to pay his taxes on time.

insurance (s) (noun), insurances (pl)
intemperance (s) (noun), intemperances (pl)
1. Lack of moderation or restraint; excess in any kind of action; specifically, excessive indulgence of any passion or appetite: Some people think they must have many pieces of cake and cookies every day and this intemperance causes them to become quite overweight or obese!
2. Immoderate consumption of alcoholic drinks; addiction to overdrinking: On too many occasions, Robert often said he was just enjoying another glass of wine, but his wife knew that this was just another form of his intemperance and, as a result, this caused their marriage to break up.
intendance
intolerance (s) (noun), intolerances (pl)
1. The quality or condition of being incapable of living in certain situations.
2. An unwillingness to recognize and respect differences in the opinions or beliefs of others.
3. An unwillingness or refusal to respect contrary opinions or beliefs, or persons of different races or backgrounds, etc.
4. The incapacity or indisposition to bear or to endure something: Jim's mother had an intolerance to excessively hot weather.
5. In medicine, an extreme sensitivity or inability to withstand, or an allergy to a drug, food, or other substance: Shirley had a lactose intolerance.