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The trailer dictionary is a key-value list. The keys are specified in Table 3.13 of the PDF Reference 1.7, e.g. /Root and /Size (both are required). /Root (dictionary) contains the document catalog. R is the keyword that indicates that the object is a reference to the catalog dictionary.

The PDF document contains eight basic types of objects described below. These types are: booleans, numbers, strings, names, arrays, dictionaries, streams and the null object. Objects may be labeled so that they can be referenced by other objects. A labeled object is also called an indirect object.

Lexicographers are currently preparing the third edition of the OED, which is 28 percent complete. No final completion date is yet confirmed.... Demand for online resources is growing but large numbers of people continue to buy dictionaries in printed form and we have no plans to stop publishing print dictionaries.

Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

Press Alt+Shift+Z to get an immediate definition (this function does not apply to local PDF documents). Alternatively, right-click on your selection and choose "Define <your selected word(s)>". The definition will appear directly beneath your selection.

Merriam-Webster: America's Most Trusted Dictionary.

AbbreviationDigital Technology. portable document format: a file format that makes it possible to display text and graphics in the same fixed layout on any computer screen. a document or file in this format.

To be included in a Merriam-Webster dictionary, a word must be used in a substantial number of citations that come from a wide range of publications over a considerable period of time. Specifically, the word must have enough citations to allow accurate judgments about its establishment, currency, and meaning.