Lit. , single , separate , alone of its kind , peculiar : litterae, i. e. abbreviations : catenae, perh. of a single ply , = simplices (or of a pound weight , i. e. light;

http://lila-erc.eu/data/lexicalResources/LewisShort/id/LexicalSense/n44388.0 an entity of type: LexicalSense

Lit. , single , separate , alone of its kind , peculiar : litterae, i. e. abbreviations : catenae, perh. of a single ply , = simplices (or of a pound weight , i. e. light; 
Lit. , single , separate , alone of its kind , peculiar : litterae, i. e. abbreviations : catenae, perh. of a single ply , = simplices (or of a pound weight , i. e. light; 

data from the linked data cloud