addible

transitive verb

1. to join or unite (something) to something else so as to increase the quantity, number, size, etc. or change the total effect: to add a wing to the building, to add seasoning to the sauce
2. to state further
3. to combine (numbers) into a sum; calculate the total of

Origin: ME adden < L addere, to add < ad-, to + dare, to give

intransitive verb

1. to cause an increase; be an addition (to): this adds to my pleasure
2. to find a sum by doing arithmetic