Meaning : The act of adding one thing to another.
Example :
The addition of flowers created a pleasing effect.
The addition of a leap day every four years.
The act of subtracting (removing a part from the whole).
He complained about the subtraction of money from their paychecks.Meaning : Something added to what you already have.
Example :
The librarian shelved the new accessions.
He was a new addition to the staff.
Synonyms : accession
Meaning : A suburban area laid out in streets and lots for a future residential area.