The difference between Appropriate and Fitting

When used as adjectives, appropriate means suitable or fit, whereas fitting means ready, appropriate, or in keeping.

Appropriate is also verb with the meaning: to make suitable.

Fitting is also noun with the meaning: a small part, especially a standardized or detachable part of a device or machine.

check bellow for the other definitions of Appropriate and Fitting

Appropriate as an adjective:

Suitable or fit; proper.

Examples:

"The headmaster wondered what an appropriate measure would be to make the pupil behave better."
Appropriate as an adjective:

Suitable to the social situation or to social respect or social discreetness; socially correct; socially discreet; well-mannered; proper.

Examples:

"I don't think it was appropriate for the cashier to tell me out loud in front of all those people at the check-out that my hair-piece looked like it was falling out of place."

"While it is not considered appropriate for a professor to date his student, there is no such concern once the semester has ended."
Appropriate as an adjective (obsolete):

Set apart for a particular use or person; reserved.

Appropriate as a verb (transitive, archaic):

To make suitable; to suit.

Examples:

"rfquote William Paley lang=inline=yes"
Appropriate as a verb (transitive):

To take to oneself; to claim or use, especially as by an exclusive right.

Examples:

"Let no man appropriate the use of a common benefit."
Appropriate as a verb (transitive):

To set apart for, or assign to, a particular person or use, especially in exclusion of all others; with to or for.

Examples:

"A spot of ground is appropriated for a garden."

"to appropriate money for the increase of the navy"
Appropriate as a verb (transitive, British, ecclesiastical, legal):

To annex (for example a benefice, to a spiritual corporation, as its property).

Examples:

"rfquotek Blackstone lang=en"

Fitting as a verb:
Fitting as a verb (informal, US, with infinitive):

Getting ready; preparing.

Examples:

"I'm fitting to go home and sleep."

Fitting as a noun:

A small part, especially a standardized or detachable part of a device or machine.
Fitting as a noun (engineering):

A tube connector; a standardized connecting part of a piping system to attach sections of pipe together, such as a coupling
Fitting as a noun:

The act of trying on clothes to inspect or adjust the fit.
Fitting as a noun (manufacturing):

The process of fitting up; especially of applying craft methods such as skilled filing to the making and assembling of machines or other products.
Fitting as a noun (chiefly, _, British):

A domestic moveable piece of furniture, which can be taken along when moving out, US furnishing (see also ).

Examples:

"the fittings of a church or study"
Fitting as a noun (uncountable):

The action or condition of having fits in the sense of seizures or convulsions.

Examples:

"Since her medication was changed, her fitting has got worse."