noun
encyclopedia
B1
Means 'encyclopedia' or 'lexicon', a reference work listing knowledge or words. German noun is neuter (das Lexikon). Plural is Lexika (formal); colloquial plural Lexikons also occurs. Declension: singular das Lexikon, plural die Lexika. Used for comprehensive reference books and word lists.
Examples
Ich habe ein Lexikon.
I have an encyclopedia.
Die Studentin benutzte ein Lexikon, weil sie die Bedeutung des Wortes nicht mehr kannte.
The female student used a dictionary because she no longer knew the meaning of the word.
Ich habe im Lexikon nach dem Begriff nachgelesen.
I looked up the term in the encyclopedia.
Details
Mnemonics
Imagine a big book with the word 'LEXIKON' on the spine filled with entries.
Sounds like 'lexicon' in English (a book of words/knowledge).
Das Lexikon — think of a neutral 'thing' (das) like an object on a table.
Notes
Lexikon usually refers to a reference book (encyclopedia); it's a neuter noun. Plural forms can be 'Lexika' or less commonly 'Lexikons'.