Final answer:
The Sapir-Whorf Hypothesis suggests that the language one speaks influences their thought processes and reality perception, aligning with linguistic relativity.
Step-by-step explanation:
The best definition of the Sapir-Whorf Hypothesis is the proposal that the particular language one speaks influences the way one thinks about reality. This hypothesis, also known as linguistic relativity, posits that different languages shape different habits of thought, impacting cultural perception and thinking. Edward Sapir and Benjamin Lee Whorf introduced this concept in the 20th century based on observations like the different interpretations and word associations for concepts like time in Hopi versus English, and cultural associations with numbers in various societies.