"replacing" in the noun sense
1. replacement, replacing
the act of furnishing an equivalent person or thing in the place of another
"replacing the star will not be easy"
"replacing" in the verb sense
substitute a person or thing for (another that is broken or inefficient or lost or no longer working or yielding what is expected
"He replaced the old razor blade"
"We need to replace the secretary that left a month ago"
"the insurance will replace the lost income"
"This antique vase can never be replaced"
2. supplant, replace, supersede, supervene upon
take the place or move into the position of
"Smith replaced Miller as CEO after Miller left"
"the computer has supplanted the slide rule"
"Mary replaced Susan as the team's captain and the highest-ranked player in the school"
3. replace, put back
put something back where it belongs
"replace the book on the shelf after you have finished reading it"
"please put the clean dishes back in the cabinet when you have washed them"
4. substitute, replace, interchange, exchange
put in the place of another switch seemingly equivalent items
"the con artist replaced the original with a fake Rembrandt"
"substitute regular milk for fat-free milk"
"synonyms can be interchanged without a changing the context's meaning"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
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