synergism /sinˈ or -ûrˈ/ noun

1. The doctrine (ascribed to Melanchthon) that the human will and the Divine Spirit are two efficient agents that co-operate in regeneration (theology)
2. Increased effect of two substances, esp drugs, obtained by using them together
3. (more generally) the working together of a number of individuals for greater effect

synˈergist (or /-ûrˈ/) noun

1. A substance which increases the effect of another (eg pesticide)
2. A muscle, etc that acts with another

synergistˈic adjective

synergistˈically adverb

synˈergize or synˈergise intransitive verb

To act as a synergist (with another substance)