The word "invalid" can be pronounced in two different ways, depending on its meaning. When used as an adjective to describe something that is not valid, it is pronounced [ɪnˈvælɪd]. However, when used as a noun to refer to someone who is disabled or sick, it is pronounced [ˈɪnvəlɪd]. This pronunciation difference is due to the stress being placed on different syllables in each usage. To avoid confusion, it is important to differentiate between the two meanings and pronunciations of "invalid".
The term "invalid" has multiple meanings and can be used as an adjective or noun. As an adjective, it refers to something that is not legally or factually valid, or lacking in force or effectiveness. It implies that certain conditions or requirements necessary for legitimacy are not met. For example, an "invalid document" could denote a document that is not recognized as legitimate due to forgery or insufficient authentication. Similarly, an "invalid argument" may refer to a statement or reasoning that lacks logical coherence or substantial evidential support.
As a noun, "invalid" refers to a person suffering from chronic illness or disability, especially one who is confined to bed or otherwise housebound. This usage is commonly associated with individuals who are unable to perform daily activities due to physical or mental limitations, requiring assistance or care from others.
Furthermore, in computing terminology, the term "invalid" can indicate the presence of an error or malfunction. For instance, an "invalid command" suggests that the command entered is not recognized or lacks the necessary syntax, preventing its execution.
Overall, whether used as an adjective or noun, "invalid" typically denotes a lack of legitimacy, efficacy, or correctness, depending on the context in which it is employed.
1. Weak, sick. 2. An infirm or sickly person; one suffering from a chronic but not wholly disabling ailment.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
• Of no force or weight; null; void.
• A person weak and infirm in health; a worn-out or disabled soldier or sailor.
• To put on the roll of invalids.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
* The statistics data for these misspellings percentages are collected from over 15,411,110 spell check sessions on www.spellchecker.net from Jan 2010 - Jun 2012.
The word "invalid" has a Latin origin. It comes from the Latin word "invalidus", which means "weak" or "not strong". The term later came to be used in English to refer to a person who is chronically ill or handicapped. Over time, it has also been used to describe something that is null or inoperative.