alteration
noun
al·ter·a·tion
ˌȯl-tə-ˈrā-shən 
plural alterations
1
: the act or process of altering something
The dress needs alteration for a proper fit.
: the state of being altered
2
: the result of changing or altering something: such as
a
: a change made in fitting a garment
no charge for alterations
b
: a change in a legal instrument that alters its legal effect
She made some alterations to her will.
c
: a mineral that has been altered by a chemical process : metasomatism
Examples of alteration in a Sentence
the alteration of the pattern
They did a good job on the dress alteration.
He made alterations in his will.
Recent Examples on the Web
The study authors also found that the ratio of gaseous carbon dioxide to ice differs significantly from what is seen in star-forming regions, indicating that the processes controlling ice formation or alteration in planetary nebulae may be very different.
—
Rupendra Brahambhatt, Interesting Engineering, 15 Mar. 2026
Even so, a few layout alterations and cosmetic updates, like opening up small spaces and inviting in more light, were called for.
—Cameron Beall, Southern Living, 15 Mar. 2026
Her Dior dress required some last-minute alterations.
—Christina Perrier, InStyle, 15 Mar. 2026
The alteration of the slavery exhibit comes at a time when any changes related to history and the American story at federal parks, museums or other public spaces are being scrutinized.
—ABC News, 12 Mar. 2026
See All Example Sentences for alteration
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Rupendra Brahambhatt, Interesting Engineering, 15 Mar. 2026
Even so, a few layout alterations and cosmetic updates, like opening up small spaces and inviting in more light, were called for.
—Cameron Beall, Southern Living, 15 Mar. 2026
Her Dior dress required some last-minute alterations.
—Christina Perrier, InStyle, 15 Mar. 2026
The alteration of the slavery exhibit comes at a time when any changes related to history and the American story at federal parks, museums or other public spaces are being scrutinized.
—ABC News, 12 Mar. 2026
See All Example Sentences for alteration
Cite this Entry
“Alteration.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alteration. Accessed 19 Mar. 2026.
Copy CitationKids Definition
alteration
noun
al·ter·ation
ˌȯl-tə-ˈrā-shən
1
a
: the act or process of altering
b
: the state of being altered
2
: the result of altering : modification
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