irreplaceable

UK: ˌɪrɪˈpleɪsəbl | US: ˌɪrɪˈpleɪsəbl

Definition

  1. adj. impossible to replace or substitute; uniquely valuable

  2. adj. (of a person or thing) so important or exceptional that no equivalent exists

Structure
ir <not>replace <to substitute>able <capable of>ir <not>replace <to substitute>re <again>place <to put>able <capable of>
Etymology

"Irreplaceable" emerged in the early 19th century, combining the negative prefix "ir-" with "replaceable" (itself from "replace"). The word reflects a logical progression: "replace" (to put back or substitute) + "-able" (ability) → "replaceable" (capable of being substituted) → "irreplaceable" (incapable of being substituted). The term captures the concept of unique value, often applied to people, artifacts, or experiences deemed one-of-a-kind.

Examples

  1. The museum’s ancient artifacts are irreplaceable due to their historical significance.

  2. After the fire, the family mourned the loss of irreplaceable photo albums.

  3. Her mentorship was irreplaceable in shaping my career.

  4. Endangered species are irreplaceable parts of our ecosystem.

  5. The handwritten letters from his grandfather felt irreplaceable.