scalar product

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The numerical product of the lengths of two vectors and the cosine of the angle between them. Also called dot product, inner product.

Wiktionary

1. n. The product of two vectors computed as the sum of the corresponding elements of the vectors, or, equivalently, as the product of the magnitudes of the vectors and the cosine of the angle between their directions.

WordNet 3.0

1. n. a real number (a scalar) that is the product of two vectors