I.e. and e.g. are abbreviations for Latin phrases and ex. is an abbreviation for an English word. Let's take a deeper look at each them. What Does I.e. Mean? "I.e" is an abbreviation for the Latin phrase "id est," which translates to "that is" or "in other words." Here's a look at "i.e." in action: "I am a vegetarian, i.e., I don't eat meat." More @Wikipedia
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