amnesia

UK: /æmˈniːziə/ US: /æmˈniʒə/ ,(am nē′zhə)

WordReference Random House Learner's Dictionary of American English © 2025

am•ne•sia /æmˈniʒə/   n. [uncountable]

1. Pathology loss of memory caused by brain injury, shock, etc.

am•ne•si•ac /æmˈniʒiˌæk, -zi-/  am•ne•sic/æmˈnisɪk, -zɪk/  n. [countable] , adj.See -mne-.

WordReference Random House Unabridged Dictionary of American English © 2025

am•ne•sia  (am nē′zhə), n. 

1. Pathology loss of a large block of interrelated memories; complete or partial loss of memory caused by brain injury, shock, etc.

• Greek amnēsía, variant of amnēstía oblivion; perhaps learnedly formed from mnē-, stem of mimné̄skesthai to remember (compare mnemonic) + -s- + -ia -ia. See amnesty
• Neo-Latin
• 1780–90

am•nes•tic  (am nes′tik), adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

amnesia / æmˈniːzjə -ʒjə -zɪə/ noun

1. a defect in memory, esp one resulting from a pathological cause, such as brain damage

Etymology: 19th Century: via New Latin from Greek: forgetfulness, probably from amnēstia oblivion; see amnesty

amnesiac / æmˈniːzɪˌæk/, amnesic / æmˈniːsɪk -zɪk/ adjective , noun