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Companion (. Doctor Who. ) In the long-running BBC television science fiction programme Doctor Who and related works, the term " companion " refers to a character who travels with, or shares adventures with, the Doctor. In most Doctor Who stories, the primary companion acts as an audience surrogate by providing the lens through which the viewer ...
Companion (ship), an architectural feature of ships. Companion animal, a pet animal kept for companionship. Companion parrot, a pet parrot that interacts with its owner. Companion matrix, a matrix with a specific relation to its characteristic polynomial p. Companion planting, planting of different crops in close physical proximity.
A caravan led by Abd Allah ibn Jahsh returns from a raid by companions of Muhammad (image c. 1594–1595) The Companions of the Prophet (Arabic: اَلصَّحَابَةُ, romanized: aṣ-ṣaḥāba, lit. 'the companions') were the disciples and followers of Muhammad who saw or met him during his lifetime, while being a Muslim and were ...
A companion diagnostic (CDx) [1] is a diagnostic test used as a companion to a therapeutic drug to determine its applicability to a specific person. [2]Companion diagnostics are co-developed with drugs to aid in selecting or excluding patient groups for treatment with that particular drug based on their biological characteristics that determine responders and non-responders to the therapy.
Companion matrix. In linear algebra, the Frobenius companion matrix of the monic polynomial is the square matrix defined as. Some authors use the transpose of this matrix, , which is more convenient for some purposes such as linear recurrence relations (see below). is defined from the coefficients of , while the characteristic polynomial as ...
A lady's companion was a woman of genteel birth who lived with a woman of rank or wealth as retainer. The term was in use in the United Kingdom from at least the 18th century to the mid-20th century but it is now archaic. The profession is known in most of the Western world. The role was related to the position of lady-in-waiting, which by the ...
The Companion cavalry was composed of the Hetairoi of the king, mainly upper class citizens who were able to acquire and maintain armour and horses. In the age of Philip II and Alexander they were organized into 8 territorial squadrons, termed ilai. Each ile numbered between 200 and 300 horsemen. [5][6] They were originally commanded by a ...
Companion (caregiving) In health care and caregiving, a companion, sitter, or private duty is a job title for someone hired to work with one patient (or occasionally two). Companions work in a variety of settings, including nursing homes, assisted living facilities, hospitals, and private homes, and their duties range from advanced medical care ...