Altar vs. Alter: Spelling Guide

If you are looking for the correct spelling, here it is: Both "altar" and "alter" are correctly spelled words, but they have entirely different meanings and cannot be used interchangeably.

"Altar" (A-L-T-A-R) is a noun referring to a sacred table or raised structure used for religious rituals. "Alter" (A-L-T-E-R) is a verb meaning to change or modify something. Mixing them up is a grammatical and spelling error. If you struggle with this pair, you are not alone—they are homophones, making them one of the most frequently confused word pairs in the American English language.

Notice how the shared "al" beginning is purely coincidental, but the endings define their separate identities: 'ar' for the sacred structure, 'er' for the action of changing.

To understand why the different endings exist, we have to look at Latin. The noun "altar" comes from the Latin word "altare", which translates to "high place" or "altar." It is built from the root "altus", meaning "high," because altars were historically raised structures used for sacrifices.

The verb "alter" comes from an entirely different Latin word: "alter", which translates to "other" or "another." Over time, the concept of making something "other" evolved into the action of changing or modifying it. English preserved the "e" ending from this root.

Noah Webster, the father of American English spelling, kept these distinct because they serve completely different grammatical functions. The "a" in altar marks it as a noun (a thing), while the "e" in alter marks it as a verb (an action).

• Leave at the altar
• Stand at the altar
• Sacrifice on the altar
• Alter a plan
• Alter a garment
• Alter the course

In daily conversation, "alter" is often used when talking about changing plans or fixing clothes. For example, "I need to alter my route," or "I had my pants altered." "Altar" is usually reserved for weddings, as in "She left him at the altar."

• Can you alter the time of our meeting to 3 PM?
• I need to have these pants altered because they are too long.
• The bride was so nervous she almost left him at the altar.
• We had to alter our travel plans due to the storm.
• She waited at the altar, but he never showed up.

In academic writing, "alter" is frequently used to describe how variables or historical events are modified. For instance, "The treaty altered the geopolitical landscape." "Altar" appears in historical or religious texts describing archaeological finds, like "The excavation revealed a sacrificial altar."

• The government altered the policy after public outcry.
• They altered the blueprint to include an extra bedroom.
• The ancient civilization built a massive stone altar for sacrifices.
• Offerings of fruit and grain were left at the altar.
• The landscape was altered by the severe wildfire.

In business and legal contexts, "alter" is a precise term for modifying documents, contracts, or software code. "We cannot alter the agreement without consent." "Altar" rarely appears in corporate settings unless discussing the structural layout of a property.

• The manager decided to alter the schedule for the week.
• They altered the blueprint to include an extra bedroom.
• Nothing could alter his decision to resign.
• The tailor altered the suit to fit him perfectly.
• Altering a contract requires both parties' signatures.