adjective
- An example of formal is a dinner party at a mansion where everyone dresses up in fancy clothes and is very polite.
- An example of formal is when a judge gives official approval of something.
The definition of formal is something that follows rules, is a dressy or important occasion, or something that has official sanctioning or approval.
formal

- of external form or structure, rather than nature or content
- of the internal form; relating to the intrinsic or essential character or nature
- of or according to prescribed or fixed customs, rules, ceremonies, etc.: a formal wedding
- having the appearance of being suitable, correct, etc., but not really so
- stiff in manner; not warm or relaxed
- designed for use or wear at ceremonies, elaborate parties, etc.: formal dress
- requiring clothes of this kind: a formal dance
- done or made in orderly, regular fashion; methodical
- very regular or orderly in arrangement, pattern, etc.; rigidly symmetrical: a formal garden
- done or made according to the forms that make explicit, definite, valid, etc.: a formal contract
- designating education in schools, colleges, etc.
- designating or of the level of language usage characterized by expanded vocabulary, complete syntactic constructions, complex sentences, etc.
Origin of formal
Middle English from Classical Latin formalis from forma, form- a formal dance or ball
- a woman's evening dress
formal Idioms
go formal
Informal to go dressed in evening clothes
formal

adjective
- a. Relating to or involving outward form or structure, often in contrast to content or meaning.b. Being or relating to essential form or constitution: a formal principle.
- Following or being in accord with accepted or prescribed forms, conventions, or regulations: had little formal education; went to a formal party.
- a. Characterized by strict or meticulous observation of forms; methodical: very formal in their business transactions.b. Stiffly ceremonious: a formal greeting.
- Characterized by technical or polysyllabic vocabulary, complex sentence structure, and explicit transitions; not colloquial or informal: formal discourse.
- Having the outward appearance but lacking in substance: a formal requirement that is usually ignored.
noun
Something, such as a gown or social affair, that is formal in nature.
Origin of formal
Middle English from Latin fōrmālis from fōrma shapeRelated Forms:
- for′mal·ly
adverb
- for′mal·ness
noun
formal

Adjective
(comparative more formal, superlative most formal)
- Being in accord with established forms.
- Official.
- Relating to the form or structure of something.
- Ceremonial.
- (horticulture) Organized; well-structured and planned.
- (mathematics) Relating to mere manipulation and construction of strings of symbols, without regard to their meaning.
- Formal series are defined without any reference to convergence.
Noun
(plural formals)
Origin
See also: formálFrom Middle English formel, from Old French formel, from Latin formalis, from forma (“form”); see form.