Temperament v. t. : Internal constitution; state with respect to the relative proportion of different qualities, or constituent parts.

Temperament v. t. : Due mixture of qualities; a condition brought about by mutual compromises or concessions.

Temperament v. t. : The act of tempering or modifying; adjustment, as of clashing rules, interests, passions, or the like; also, the means by which such adjustment is effected.

Temperament v. t. : Condition with regard to heat or cold; temperature.

Temperament v. t. : A system of compromises in the tuning of organs, pianofortes, and the like, whereby the tones generated with the vibrations of a ground tone are mutually modified and in part canceled, until their number reduced to the actual practicable scale of twelve tones to the octave. This scale, although in so far artificial, is yet closely suggestive of its origin in nature, and this system of tuning, although not mathematically true, yet satisfies the ear, while it has the convenience that the same twelve fixed tones answer for every key or scale, C/ becoming identical with D/, and so on.

Temperament v. t. : The peculiar physical and mental character of an individual, in olden times erroneously supposed to be due to individual variation in the relations and proportions of the constituent parts of the body, especially of the fluids, as the bile, blood, lymph, etc. Hence the phrases, bilious or choleric temperament, sanguine temperament, etc., implying a predominance of one of these fluids and a corresponding influence on the temperament.

Example:
How does your current Temperament differ from when you were younger?

Taxonomy
Temperament Bibliography, Adult, infants, individuality, research, individual differences, temperamental characteristics, parents, personalities, child behavior, behavioral scientists, Stella chess, Listserv, New Version, true self, babies, physical characteristics, hair.

Defination from the web:
Information about temperamental individuality in infants, children and adults. Research and practical information about temperamental characteristics in research and practice.