# Dictionary Definition

informal adj

1 not formal; "conservative people unaccustomed
to informal dress"; "an informal free-and-easy manner"; "an
informal gathering of friends" [ant: formal]

2 not officially recognized or controlled; "an
informal agreement"; "a loose organization of the local farmers"
[syn: loose]

3 used of spoken and written language [ant:
formal]

4 having or fostering a warm or friendly
atmosphere; especially through smallness and informality; "had a
cozy chat"; "a relaxed informal manner"; "an intimate cocktail
lounge"; "the small room was cozy and intimate" [syn: cozy, intimate]

# User Contributed Dictionary

## English

### Pronunciation

- Rhymes with: -ɔː(r)məl

### Adjective

- Not formal or
ceremonious;
casual.
- an informal get-together

- Not in accord with
the usual regulations; unofficial.
- an informal agreement

- Suited for everyday use.
- informal clothes

- In the context of "of language": Reflecting everyday, non-ceremonious usage.

#### Translations

not formal or ceremonious; casual

- Czech: neformální

### See also

# Extensive Definition

The term formal has a number of uses,
including:

## General

- relating to formality
- opposite of informal

## Social

- Formal
occasion
- Formal attire worn on such occasions
- Formals are particular meals at some British universities
- In Australian or British English, a "formal" is the equivalent of the American prom dance.
- In American English, a "formal" is organized by a college or university organization, typically but not always a fraternity or sorority.

- Informal
occasion (included as Informal redirect
here); see Dress
code (Western) for the distinctions between Formal,
Semi-formal, and Informal
- Informal attire (not to be confused with Casual -- see Dress code (Western))

## Philosophical

- relating to form, i.e.
appearance rather than essence.
- relating to Formalism, i.e. emphasis on form over content or meaning.

- formal logic logical argument based only on the form and not on the meaning.
- Formal cause, Aristotle's intrinsic, determining cause.

## Mathematics

- formal power series, a generalization of power series without requiring convergence, used in combinatorics;
- formal calculation, a calculation which is systematic, but without a rigorous justification;
- formal set theory as opposed to naive set theory;
- formal derivative, an operation on elements of a polynomial ring which mimics the form of the derivative from calculus.

### Logic and Language

- formal
system, an abstract means of generating inferences in a formal
language;
- formal
language, comprising the symbolic "words" or "sentences" of a
formal system;
- formal grammar, a grammar describing a formal language;

- formal proof, a fully rigorous proof as is possible only in a formal system.

- formal
language, comprising the symbolic "words" or "sentences" of a
formal system;

## Computer science

- formal
methods in computer science, including:
- formal specification describes what a system should do, not how it should do it
- formal verification proves correctness of a system

See also the Language section of Mathematics,
above

## Linguistic

- Formal equivalence word-for-word translation (especially of the Bible)

See also the Language section of Mathematics,
above

## Chemical

- A unit of concentration
- short or prefix form for formalin
- short or prefix form for formaldehyde
- synonym for dimethoxymethane

## See also

informal in German: Formalität

informal in French: Formel

informal in Italian: Formalità

informal in Dutch: Formeel

informal in Simple English: Formal

# Synonyms, Antonyms and Related Words

Bohemian, affable, beat, beat-up, bedraggled, blowzy, breakaway, careless, casual, chintzy, colloquial, common, conversational, cordial, degage, dilapidated, drabbletailed, draggled, draggletailed, easy, easygoing, en deshabille,
everyday, familiar, far out, folksy, free, free and easy, fringy, frowzy, frumpish, frumpy, garden-variety, gracious, grubby, haymish, heretical, heterodox, hippie, homely, homey, in dishabille, in rags,
irregular, kinky, loose, lumpen, maverick, messy, mussy, natural, negligent, nonstandard, not cricket,
not done, not kosher, offbeat, offhand, offhanded, ordinary, original, plain, poky, private, ragged, raggedy, relaxed, ruinous, scraggly, seedy, shabby, shoddy, simple, slack, slatternly, slipshod, sloppy, slovenly, sluttish, sociable, sordid, special, spoken, spontaneous, sporty, squalid, substandard, tacky, tattered, unaffected, unassuming, unauthorized, unceremonious, unconstrained, unconventional, uneducated, unfashionable, unkempt, unliterary, unneat, unofficial, unorthodox, unpretentious, unsightly, unstudied, untidy, vernacular, way
out