amnesia

noun

am·​ne·​sia am-ˈnē-zhə 

1

: loss of memory due usually to brain injury, shock, fatigue, repression, or illness

2

: a gap in one's memory

3

: the selective overlooking or ignoring of events or acts that are not favorable or useful to one's purpose or position

… Americans seemed to develop a willful forgetfulness about the nation's longest military conflict, an amnesia that lasted for nearly a decade.

—Alan Brinkley

amnesiac

am-ˈnē-zhē-ˌak 

-zē-

adjective or noun

or amnesic

am-ˈnē-zik 

-sik

Examples of amnesia in a Sentence

Recent Examples on the Web

Vaccines can also prevent immune amnesia, a phenomenon where the virus wipes out parts of the immune system, leaving kids vulnerable to new infections for several years. —Maria Godoy, NPR, 14 Mar. 2026

Whether out of arrogance, capriciousness, or collective amnesia, this recent history was ignored. —John Cassidy, New Yorker, 13 Mar. 2026

That lack of an official accounting encouraged a willful amnesia about the regime’s crimes and, Mendonça Filho has argued, led directly to the 2018 election of Jair Bolsonaro, who ran on a platform of sneering nostalgia for the era of military rule. —Michael Snyder, The Atlantic, 13 Mar. 2026

Victor transplants Hans’ brain into Christina’s body, curing her paralysis but giving her amnesia. —Rory Doherty, Time, 7 Mar. 2026

Word History

Etymology

borrowed from New Latin amnēsia, borrowed from Greek (Septuagint) amnēsía "forgetfulness," variant of amnēstía — more at amnesty entry 1

First Known Use

1772, in the meaning defined at sense 1

Rhymes for amnesia

• atresia
• babesia
• anaesthesia
• analgesia
• anesthesia
• dyskinesia
• paresthesia
• hyperalgesia
• hyperesthesia

Kids Definition

amnesia

noun

am·​ne·​sia am-ˈnē-zhə 

: severe loss of memory

amnesiac

-z(h)ē-ˌak 

adjective or noun

Medical Definition

amnesia

noun

am·​ne·​sia am-ˈnē-zhə 

1

: loss of memory sometimes including the memory of personal identity due to brain injury, shock, fatigue, repression, or illness or sometimes induced by anesthesia

a period of amnesia after the wreck

2

: a gap in one's memory

an amnesia concerning her high-school years