1. (noun) a component that is added to something to improve it

• add-on
• improver

2. (noun) a quantity that is added

• gain
• increase

3. (noun) something added to what you already have

• accession

4. (noun) the arithmetic operation of summing; calculating the sum of two or more numbers

• plus
• summation

1. (noun) a component that is added to something to improve it

• additive
• afterthought
• annex
• annexe
• extension
• wing
• attachment
• elongation
• extension

2. (noun) the act of adding one thing to another

• fluoridation
• fluoridisation
• fluoridization
• retrofit

3. (noun) a quantity that is added

• accretion

1. (noun) a component that is added to something to improve it

• component
• constituent
• element

2. (noun) the act of adding one thing to another

• increase
• step-up

3. (noun) a quantity that is added

• indefinite quantity

4. (noun) something added to what you already have

• acquisition

5. (noun) a suburban area laid out in streets and lots for a future residential area

• suburb
• suburban area
• suburbia

6. (noun) the arithmetic operation of summing; calculating the sum of two or more numbers

• arithmetic operation

1. (noun) a component that is added to something to improve it

• add
• bestow
• bring
• contribute
• impart
• lend
• add on
• ameliorate
• amend
• better
• improve
• meliorate

2. (noun) the act of adding one thing to another

• add

3. (noun) a quantity that is added

• increase
• increase

4. (noun) the arithmetic operation of summing; calculating the sum of two or more numbers

• add
• add together
• add
• add
• add together
• add together
• add up
• add up
• sum
• sum
• sum up
• sum up
• summate
• summate
• tally
• tally
• tot
• tot
• tot up
• tot up
• total
• total
• tote up
• tote up
• summational
• summative

1. (noun) the act of adding one thing to another

• deduction
• subtraction