What does alter mean?
Alter is a transitive verb meaning to change something — to modify its form, character, or details while it remains recognizably the same thing. When you alter a dress, you reshape the existing garment; when you alter a plan, you adjust it rather than abandon it. This nuance distinguishes alter from the broader word change: alteration implies working on what already exists, making it a favourite of tailors, editors, architects, and anyone revising a document or itinerary. The word derives from the Latin alter, meaning 'the other of two', which also gives English words such as alternative, altruism, and the phrase alter ego. Alter is neutral in register and connotation, equally at home in legal prose ('terms may be altered with mutual consent') and casual conversation ('we had to alter our booking'). Its most common companion in spelling confusion is altar, the religious structure — a mix-up so frequent that careful writers double-check which one they mean.
verbTo change something, typically in a way that modifies its character, form, or details while keeping it fundamentally the same thing.
- To change or modify something, especially in a way that adjusts rather than completely transforms it (e.g. altering a garment, altering plans).
"The tailor altered the dress so it fit perfectly."
"Nothing about the house had been altered since the 1970s."
"Circumstances forced her to alter her travel arrangements at the last minute."
One letter separates 'alter' from 'altar' — and mixing them up has embarrassed writers for centuries.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of alter
Alter comes from the Latin verb alterare, meaning 'to change', derived from alter, 'other (of two)'. The word entered English in the late Middle Ages via Old French alterer, and has been in continuous use since. Its Latin root also underlies a family of English words including alternative, altruism, altercation, and adulterate, all carrying some sense of otherness or change.
Related word forms
How alter is actually used
Alter is a standard, neutral verb in both formal and everyday English. It implies modification of an existing thing rather than replacement — 'alter' suggests adjustment, while 'change' can suggest wholesale transformation. It is frequently used with clothing, documents, plans, and structures.
Easily confused with alter
Alter is a verb meaning to change something, while altar is a noun referring to a raised structure used for religious ceremonies or offerings.