Also known as: word of art · terms of art · term of art
Written by attorneys · grounded in primary & secondary sources — see below
Specialized terminology that carries a precise, established meaning within a particular profession, technical field, or area of law. Courts assign that settled technical meaning to such terms when the transaction occurs inside the relevant field unless the parties clearly manifest a contrary intention.
Select any source to read its text and confirm it supports the definition.
Wesley Wong, an electronics manufacturer, contracted with Watershed Pharmaceuticals to supply circuit boards labeled IPC Class 3 compliant. Wong rejected the boards because they failed the precise industry reliability specifications attached to that designation. The court applied the technical meaning used in electronics manufacturing rather than a general high-quality standard.
Winston Ward signed an employment agreement with Windham Technologies containing an arbitration provision that covered disputes involving commerce. Ward argued the clause used ordinary language and did not reach his claim. The court treated the phrase as a word of art carrying its established limited jurisdictional meaning under federal statutes.
Whitney Washington contracted with Wolverine Steel to supply parts under a writing that required any modification to be signed. After oral changes, Washington claimed the writing controlled. The court examined whether the signed-writing requirement functioned as a technical term of art under the UCC between merchants.
Wayne Walker pleaded guilty after his lawyer failed to warn him that the offense carried immigration consequences. Walker asserted the lawyer should have recognized the offense as an aggravated felony, a technical immigration term. The court held that counsel must advise on the precise legal effect of such words of art.
Wanda Williams invested in a company whose suppliers made false statements about revenue recognition practices. Williams sued the suppliers as aiders and abettors. The court required her to show reliance on the suppliers own statements rather than treating secondary actors as primary through technical securities terminology.
When parties use words of art in a transaction within the relevant technical field, courts give those terms their established technical meaning unless the parties clearly manifest a different intention. This rule appears in Restatement (Second) of Contracts § 202(3)(b) and is applied in multiple bar exam questions involving industry standards such as IPC Class 3 or ISO/TS 16949.
Supporting sources
…is ever simple with immigration law, the terms ‘conviction,’ ‘moral turpitude,’ and ‘single scheme of criminal misconduct’ are terms of art”); id. , §4.67, at 130 (“[T]he term ‘moral turpitude’ evades precise definition”). Defense counsel who consults a guidebook on whether a particular crime is an “aggravated felony” will…
…are understood to have a more limited reach. In Allied-Bruce itself the Court said the words
…only misstatements, omissions by one who has a duty to disclose, and manipulative trading practices (where “manipulative” is a
…was a contract "between merchants." Although in ordinary language a manufacturer is not a merchant, "between merchants" is a term of art
No. Courts routinely enforce the settled technical meaning of words of art even when the writing contains no express definition, provided the transaction occurs inside the technical field. Bar questions emphasize that parties need not insert bespoke definitions for every industry term.
Supporting sources
If each party reasonably attaches a materially different meaning to the term and neither has reason to know of the other's interpretation, no mutual assent exists and no contract is formed on that point. This outcome is illustrated in a bar question involving a lay property owner and a telecommunications company using the phrase small cell site.
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Course of performance accepted without objection receives great weight under Restatement (Second) of Contracts § 202(4), but it does not override a clear technical meaning manifested at formation when sophisticated parties operate inside the regulated field. Essay answers stress that later conduct cannot contradict the initial technical intent shown by engineers or regulatory references.
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