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I will give a simple and very general definition of `homotopy-algebra' for an operad. This extends Segal's Gamma-space idea (homotopy topological commutative monoids), but works in arbitrary monoidal categories, not just those in which the product is cartesian. For instance, applied to the operad whose algebras are monoids, it gives a notion of homotopy differential graded algebra. Along the way, we will find a new perspective on what a simplicial object is.