What is Lexicography?

Answer 1

A Lexicon is a legal dictionary; so I assume that lexicography is the study of legal words.

Answer 2

Practical lexicography is the art or craft of compiling, writing and editing dictionaries.
Theoretical lexicography is the scholarly discipline of analyzing and describing the semantic relationships within the lexicon (vocabulary) of a language and developing theories of dictionary components and structures linking the data in dictionaries. This is sometimes referred to as metalexicography.
A person devoted to lexicography is called a lexicographer, famously defined in Samuel Johnson's Dictionary of the English Language (1755) as "A writer of dictionaries; a harmless drudge that busies himself in tracing the original, and detailing the signification of words".

General lexicography focuses on the design, compilation, use and evaluation of general dictionaries, i.e. dictionaries that provide a description of the language in general use. Such a dictionary is usually called a general dictionary or LGP dictionary.

Organizing the components of the dictionary
Choose the appropriate structures for presenting the data in the dictionary
Selecting words
Choosing lemma forms for each word
Defining words
Organizing definitions
Specifying pronunciations of words
Labeling definitions and pronunciations for register and dialect, where appropriate

Answer 3

I'll give you a much simpler definition so you don't have to read really long stuff.
the principles and procedures involved in writing, editing, or compiling dictionaries.

Answer 4

It's the writing, editing, or compiling of dictionaries.