What of these is most useful for deciding which dictionary definition the best one an unfamiliar word you have found in a reading passage?

You're absolutely right! The context of the word in the passage is the most useful tool for choosing the right dictionary definition.

Here's why:

* Multiple Meanings: Many words have multiple definitions. Without context, it's impossible to know which meaning the author intended.

* Nuance: Even within a single definition, there can be subtle shades of meaning. Context helps you understand which nuance is most relevant to the passage.

* Figurative Language: Words can be used figuratively (e.g., metaphors, similes) where their literal definition doesn't apply. Context is crucial for recognizing and interpreting these instances.

How to use context:

1. Read the sentence carefully: Pay attention to the words and phrases surrounding the unfamiliar word.

2. Consider the topic and tone: What is the overall theme of the passage? Is it formal or informal? This can help you narrow down possible definitions.

3. Try substituting synonyms: Can you replace the unfamiliar word with a synonym that makes sense in the context?

Other helpful tips:

* Look for clues in the passage: Are there any definitions or explanations provided within the passage?

* Consider the author's purpose: Why did the author use this word? What point are they trying to make?

By carefully considering the context, you'll be able to select the most accurate dictionary definition and understand the author's intended meaning.