Synonyms of the word

additive

• adj. (mathematics) Pertaining to addition; that can be, or has been, added.
• adj. (mathematics, of a function, etc.) Distributive over addition.
• adj. (algebra) Having addition as an operator.
• adj. (chemistry) Pertaining to chemical addition.
• adj. (genetics) Describing genes (or the interaction etc. of such genes) which govern the same trait and whose…
• n. A substance added to another substance or product for its ability to alter its properties.
• n. (grammar) A word or phrase that adds something, such as also, even, or nor.

accumulative

• adj. Characterized by accumulation; serving to collect or amass; cumulative; additional.
• adj. Having a propensity to amass; acquisitive.

add-on

• n. Something which can be appended to something else.
• n. (computer hardware, software) A software extension or hardware peripheral that provides additional functions…
• n. (poker) Additional chips that can be purchased at specific times in tournament play.

addable

• adj. Alternative spelling of addible.

addible

• adj. Capable of being added.

addition

• n. (uncountable) The act of adding anything.
• n. Anything that is added.
• n. (uncountable) The arithmetic operation of adding.
• n. (music) A dot at the right side of a note as an indication that its sound is to be lengthened one half.
• n. (law) A title annexed to a person's name to identify him or her more precisely, as in "John Doe, Esq.",…
• n. (heraldry) Something added to a coat of arms, as a mark of honour; opposed to abatement.

additional

• adj. Supplemental or added to something.
• n. Something added.

bilinear

• adj. (mathematics, of a function in two variables) Linear (preserving linear combinations) in each variable.
• adj. (physics) Relating to or consisting of two linear functions.
• n. (mathematics) A bilinear function.

complemental

• adj. Of the nature of a complement; completing.
• adj. Complementary.
• adj. (obsolete) Additional; supplemental, accessory; ancillary.
• adj. (obsolete) Of the nature of a ceremony that is not essential but accessory; ceremonial; ceremonious; formal.
• adj. (obsolete) Of persons: accomplished; talented; experienced.
• adj. (obsolete) Complimentary.

complementary

• adj. Acting as a complement.
• adj. (genetics) Of the specific pairings of the bases in DNA and RNA.
• adj. (physics) Pertaining to pairs of properties in quantum mechanics that are inversely related to each other,…
• n. A complementary colour.
• n. (obsolete) One skilled in compliments.

completing

• v. present participle of complete.

cumulative

• adj. Incorporating all current and previous data up to the present or at the time of measuring or collating.
• adj. That is formed by an accumulation of successive additions.
• adj. That tends to accumulate.
• adj. (finance) Having priority rights to receive a dividend that accrue until paid.

extra

• adj. Beyond what is due, usual, expected, or necessary; extraneous; additional; supernumerary.
• adj. (dated) Extraordinarily good; superior.
• adj. (Canada, US, slang) Over-the-top; going beyond what is normal or expected, often in a dramatic mannner.
• adv. (informal) To an extraordinary degree.
• n. (cricket) A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball;…
• n. An extra edition of a newspaper, which is printed outside of the normal printing cycle.
• n. (acting) A supernumerary or walk-on in a film or play.
• n. Something of an extra quality or grade.

improver

• n. Something that, or someone who, improves something.
• n. (obsolete) Specifically, a person who improves land or property, a landscaper.
• n. One who improves his or her performance, one who shows improvement (of individuals or groups).
• n. A substance added to cause improvement (especially to a foodstuff).

incremental

• adj. Pertaining to an increment.
• adj. Occurring over a series of gradual increments, or small steps.

intercalary

• adj. (of a time period) inserted between others; leap (as in leap day or leap year).
• adj. (botany) of a meristem: situated between zones of permanent tissue, thus a shoot growing at the base of…

linear

• adj. Having the form of a line; straight.
• adj. Of or relating to lines.
• adj. Made in a step-by-step, logical manner.
• adj. (botany, of leaves) Long and narrow, with nearly parallel sides.
• adj. (physics) A type of length measurement involving only one spatial dimension (as opposed to area or volume).

summational

• adj. Of or pertaining to summation.

summative

• adj. Of, pertaining to, or produced by summation.

supplemental

• adj. Acting to supplement.
• adj. Appending.
• adj. Lacking a regular schedule (as in a supplemental airline).
• n. Something that supplements or adds to.
• n. A requisition or article of legislation that provides additional funding for a program.

supplementary

• adj. Additional; added to supply what is wanted.
• n. Something additional; an extra.