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pre-	a prefix that means "before." [2 definitions]
prefix	a word part with its own meaning that is added to the beginning of a word to make a new word that has a different meaning. "Re-" in "reform" is a prefix.
pro-¹	a prefix that means "forward." [2 definitions]
re-	a prefix that means "again" or "anew." [2 definitions]
root¹	the part of a word to which other word parts, such as suffixes and prefixes, can be added--or a free-standing word with no other word parts. The word "heat" is a free-standing word that also functions as a root. When you combine this root with the prefix "pre-," for example, you get a new word, "preheat," that means to heat up in advance. [1/9 definitions]
self-	a prefix that means of, by, to, for, or in oneself or itself.
sept-¹	a prefix that means "seven."
sex-¹	a prefix that means "six."
step-	a prefix that means "related because someone married again."
stone-	a prefix that means "in a complete way."
sub-	a prefix that means "under" or "below." [2 definitions]
super-	a prefix that means "above" or "over." [2 definitions]
trans-	a prefix that means "across" or "over." [3 definitions]
tri-	a prefix that means "three."
ultra-	a prefix that means "above" or "beyond." [2 definitions]
un-	a prefix that means "not." [2 definitions]
under-	a prefix that means "below" or "beneath." [2 definitions]
uni-	a prefix that means "one" or "single."
up-	a prefix that means "up" or "upward."
zoo-	a prefix that means "animal."

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