13-Letter Words Containing: T,A,R,I,F,F

• The extent to which something is affordable, as measured by its cost relative to the amount that the purchaser is able to pay.

• defensive structure consisting of walls or mounds built around a stronghold to strengthen it

• the art or science of strengthening defenses

• the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food)

• renewed affirmation

• To furnish with too few staff; to staff inadequately.

• The situation of having insufficient members of staff.

• mark as different

• be a distinctive feature, attribute, or trait; sometimes in a very positive sense

• calculate a derivative; take the derivative

• become different during development

• evolve so as to lead to a new species or develop in a way most suited to the environment

• become distinct and acquire a different character

• To reforest.

• relating to or showing a difference

• involving or containing one or more derivatives

• the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx

• a quality that differentiates between similar things

• a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves

• the conversion of bare or cultivated land into forest (originally for the purpose of hunting)