The difference between Average and Ordinary

When used as nouns, average means the arithmetic mean, whereas ordinary means a devotional manual.

When used as adjectives, average means constituting or relating to the average, whereas ordinary means having regular jurisdiction.

Average is also verb with the meaning: to compute the average of, especially the arithmetic mean.

check bellow for the other definitions of Average and Ordinary

Average as a noun (mathematics):

The arithmetic mean.

Examples:

"The average of 10, 20 and 24 is (10 + 20 + 24)/3 = 18."
Average as a noun (statistics):

Any measure of central tendency, especially any mean, the median, or the mode.
Average as a noun (legal, marine):

Financial loss due to damage to transported goods; compensation for damage or loss.
Average as a noun:

Customs duty or similar charge payable on transported goods.
Average as a noun:

Proportional or equitable distribution of financial expense.
Average as a noun (sports):

An indication of a player's ability calculated from his scoring record, etc.

Examples:

"batting average'"
Average as a noun (UK, in the plural):

In the corn trade, the medial price of the several kinds of grain in the principal corn markets.

Average as an adjective (not comparable):

Constituting or relating to the average.

Examples:

"The average age of the participants was 18.5."
Average as an adjective:

Neither very good nor very bad; rated somewhere in the middle of all others in the same category.

Examples:

"I soon found I was only an average chess player."
Average as an adjective:

Typical.

Examples:

"The average family will not need the more expensive features of this product."
Average as an adjective (informal):

Not outstanding, not good, banal; bad or poor.

Average as a verb (transitive):

To compute the average of, especially the arithmetic mean.

Examples:

"If you average 10, 20 and 24, you get 18."
Average as a verb (transitive):

Over a period of time or across members of a population, to have or generate a mean value of.

Examples:

"The daily high temperature last month averaged 15°C."

"I averaged 75% in my examinations this year."
Average as a verb (transitive):

To divide among a number, according to a given proportion.

Examples:

"to average a loss"
Average as a verb (intransitive):

To be, generally or on average.

Average as a noun (UK, legal, obsolete):

The service that a tenant owed his lord, to be done by the animals of the tenant, such as the transportation of wheat, turf, etc.

Ordinary as an adjective (legal, of a judge):

Having regular jurisdiction; now only used in certain phrases.
Ordinary as an adjective:

Being part of the natural order of things; normal, customary, routine.

Examples:

"On an ordinary day I wake up at nine o'clock, work for six hours, and then go to the gym."
Ordinary as an adjective:

Having no special characteristics or function; everyday, common, mundane; often deprecatory.

Examples:

"I live a very ordinary life most of the time, but every year I spend a week in Antarctica."

"He looked so ordinary, I never thought he'd be capable of murder."
Ordinary as an adjective (Australia, New Zealand, colloquial, informal):

Bad or undesirable.

Ordinary as a noun (obsolete):

A devotional manual.
Ordinary as a noun (Christianity):

A rule, or book of rules, prescribing the order of service, especially of Mass.
Ordinary as a noun:

A person having immediate jurisdiction in a given case of ecclesiastical law, such as the bishop within a diocese.
Ordinary as a noun (obsolete):

A set portion of food, later as available for a fixed price at an inn or other eating establishment.
Ordinary as a noun (archaic, _, or, _, historical):

A place where such meals are served; a public tavern, inn.
Ordinary as a noun (heraldry):

One of the standard geometric designs placed across the center of a coat of arms, such as a pale or fess.
Ordinary as a noun:

An ordinary thing or person; the mass; the common run.
Ordinary as a noun (historical):

A penny-farthing bicycle.