A necessary ingredient.
A fundamental ingredient.
Necessary.
Necessary for survival but not synthesized by the organism, thus needing to be ingested.
Being in the basic form; showing its essence.
Really existing; existent.
Very important; of high importance.
Having the nature of essence; not physical.
Such that each complementary region is irreducible, the boundary of each complementary region is incompressible by disks and monogons in the complementary region, and no leaf is a sphere or a torus bounding a solid torus in the manifold.
Idiopathic.
An act of supplying a device, structure, etc., with new components or parts that were not previously available or installed; a retrofitting.
A change made to a device, structure, etc., by introducing components or parts that were not previously available or installed.
To supply (a device, structure, etc.) with new components or parts that were not previously available or installed; to modernize.
Synonym of backport (“to retroactively supply a fix or feature to a previous version of a software product at the same time or after supplying it to the current version.”)
To give new characteristics or make alterations (to someone or something) to suit them to changed circumstances.
To supply a device, structure, etc., with new components or parts that were not previously available or installed.
To add or substitute (new components or parts) that were not previously available for or installed in a device, structure, etc.