The document outlines 7 key terms and principles used in landscape design: axis, mass-effect, focal point, unity, divisional lines, proportion and scale, and texture. Axis refers to imaginary lines that create balance. Mass-effect is the use of large groups of similar plants. Focal point is an attractive architectural feature that is a center of visual interest. Unity merges different garden elements into a cohesive whole. Divisional lines should not be too rigid. Proportion and scale ensure designs look aesthetically pleasing. Texture determines the overall visual character of the garden.