STRAIN

(physics) deformation of a physical body under the action of applied forces

Difficulty that causes worry or emotional tension

Example: "She endured the stresses and strains of life"

A succession of notes forming a distinctive sequence

Example: "She was humming an air from beethoven"

(psychology) nervousness resulting from mental stress

Example: "His responsibilities were a constant strain"

A special variety of domesticated animals within a species

Example: "He experimented on a particular breed of white rats"

(biology) a group of organisms within a species that differ in trivial ways from similar groups

Example: "A new strain of microorganisms"

Injury to a muscle (often caused by overuse); results in swelling and pain

The general meaning or substance of an utterance

Example: "Although i disagreed with him i could follow the tenor of his argument"

An effortful attempt to attain a goal

An intense or violent exertion

The act of singing

Example: "With a shout and a song they marched up to the gates"