Definition of "interlingua"

Representation principles

Why a semantic, not pragmatic, representation?

Why lexical-dependency syntax?

Why thematic roles? Do they not overspecify?

Language independence

If it's really true that

The aim of an IL is to capture language-independent semantic expressions

then how can it be true that

It is difficult to design an IL that covers all known languages

What does it even mean to "cover" a language with an interlingua?