The word "distinction" originates from the Latin word "distinguere," meaning "to separate between, keep separate, mark off."  This Latin root is the basis for the Old French "distinction" and eventually the Middle English "distinccioun". 

The noun "distinction" was first used in English in the Middle English period, specifically around 1225.   

The various meanings of "distinction". 
1. a difference or contrast between similar things or people. 
"there is a sharp distinction between what is work and what is leisure" 
synonyms: difference, contrast, dissimilarity, variance, variation, separation

Examples of "distinction" used in a sentence: 
"There are no obvious distinctions between the two designs." 
"She made a distinction between the words 'less' and 'fewer.'”
"He was raised in a small town of no great distinction." 
"The distinction left her feeling torn." 
"Being educated in the United States has long been a mark of distinction for the elites of other nations."
"The distinction of genders is not marked, except in proper names of men and women."
"Nevertheless, the distinction between activity and pleasure is true." 
"Admiral Canevaro, who had gained distinction as commander of the international forces in Foreign affairs."

Just the facts:

DISTINCTION Definition & Meaning - Merriam-Webster

DISTINCTION Synonyms: 218 Similar and Opposite Words | Merriam-Webster Thesaurus