substantialy

Substantialy is generally not recognized as a valid word in standard English. It is commonly a misspelling of substantial or substantially, which are the correct forms in their respective parts of speech. The misspelling arises from confusion between the adjective form substantial and the adverb form substantially, which ends with -ly rather than -y.

The root of both substantial and substantially lies in the Latin word substantia, meaning substance. English adopted substantial as an adjective in Middle English to describe something of real, tangible, or meaningful size, value, or importance, and formed substantially by adding the adverbial ending -ly to create the corresponding adverb.

Substantial (adjective) can mean several related things: of considerable size, extent, or importance; real or tangible as opposed to insubstantial or theoretical; or providing enough material or evidence to be convincing (as in substantial evidence). The term is versatile in contexts such as economics, law, architecture, and everyday description (e.g., “a substantial increase,” “a substantial meal,” “a substantial building”).

Substantially (adverb) means to a large extent or degree; largely; markedly. It is used to modify verbs, adjectives, or other adverbs (e.g., “Prices increased substantially,” “The project is substantially complete”). In legal or technical writing, phrases like “substantially all,” “substantially the same,” or “substantial evidence” are common and carry precise emphasis on material significance.

There is also the noun form substantiality, referring to the quality of being substantial, though it is relatively uncommon outside philosophical or formal contexts. In summary, substantialy should be replaced by substantially or substantial, depending on the intended part of speech.