By inference, the speaker means that the earth is a communal place and belong to all not one tribe, ethnic group, or one person. That is, one one has a monopoly on earth.
An inference is a process of deduction that includes making informed predictions about missing bits of information based on known information. Inference is a technique that people utilize all the time in their daily lives: it is the act of extrapolating information.
People can use inferences to reach logical conclusions based on data. An inference definition in literature is anything learnt by a mixture of the reader's knowledge, historical context, and what is known about the author.
Making conclusions is an essential component of reading. Writers will frequently leave out material on purpose, leaving readers to guess what is missing based on the evidence. This keeps the audience interested in the tale.
A novel that needed no assumptions at all would most likely be exceedingly boring to read because it would openly express every aspect for the readers.
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