In the title of book The Cambridge Companion to Philosophical Methodology, does "companion" mean this books is a complement to another book?
Bing's dictionary says:
Companion
...
one of a pair of things intended to complement or match each other: "a companion volume" synonyms: complement · counterpart · fellow · mate · twin · other half · match · accompaniment · supplement · addition · adjunct · appendage · accessory · auxiliary
- a book that provides information about a particular subject: "the Oxford Companion to English Literature" synonyms: handbook · manual · guide · reference book · ABC · primer · vade mecum · enchiridion · instruction book
According to Bing, does "companion" here mean a standalone book, which is "a book that provides information about a particular subject"?
Does "companion" imply at which level the book is presented? Advanced, intermediate, or introductory?
How can one tell whether "companion" in a book's title means it accompanies another book or it is a standalone book?