in·for·mal / inˈfôrməl/ •
adj. having a relaxed, friendly, or unofficial style, manner, or nature: an informal atmosphere | an informal agreement between the two companies. ∎ of or denoting a style of writing or conversational speech characterized by simple grammatical structures, familiar vocabulary, and use of idioms, e.g., tu in French. ∎ (of dress) casual; suitable for everyday wear.DERIVATIVES: in·for·mal·i·ty / ˌinfôrˈmalitē/ n.in·for·mal·ly adv.
The informal naming of a stratigraphic unit
occurs when (a
) the unit-term is referred to as an ordinary noun, and not in the context of a proper name, e.g. ‘the geologic periods’; and (b
) when a unit-term (such as zone
, or formation
) is referred to without having been specifically established in classification, e.g. ‘a sandstone formation’, ‘a mineralized zone’. Terms used informally are not capitalized. Compare FORMAL
. See STRATIGRAPHIC NOMENCLATURE
A term in LINGUISTICS for a situation or a use of language that is common, non-official, familiar, casual, and often colloquial, and contrasts in these senses with formal
. Whereas Would you be so good as to help me?
is highly FORMAL
, Lend us a hand
, would you?
is highly informal.