What's the difference between supersede and supersession?

Supersede

Definition:

(v. t.) To come, or be placed, in the room of; to replace.
(v. t.) To displace, or set aside, and put another in place of; as, to supersede an officer.
(v. t.) To make void, inefficacious, or useless, by superior power, or by coming in the place of; to set aside; to render unnecessary; to suspend; to stay.
(v. t.) To omit; to forbear.

Example Sentences:

(1) It was superseded by a new version earlier this year.
(2) At higher [Ca2+]i, the effect of K+ channels on Em is superseded by opening of nonselective cation channels, producing depolarization.
(3) The cephalic signal can be superseded by juvenile hormone, whose presence is necessary for each follicle to become vitellogenic.
(4) In an age of economic crisis, the tacit assumption of the governing class is that political reform is superseded by the growing demand for security.
(5) Radiological studies of Willis' circle morphology are mainly performed in search of intracerebral aneurysms, and for this purpose digital imaging has not superseded conventional radiology.
(6) This extracellular action may supersede the action of collagenase and the activity of these different enzymes would thus be regulated by changes in the nature of this microenvironment.
(7) Indeed, by the mid-17th century, Caravaggism was already out of favour in Rome and had been superseded by a Raphaelesque classicism, practised most gracefully by Annibale Carracci.
(8) In spite of his life seeming superficially great, in spite of all the praise and accolades, in spite of all the loving friends and family, there is a predominant voice in the mind of an addict that supersedes all reason and that voice wants you dead.
(9) During the period under review the Phemister procedure was replaced by percutaneous epiphysiodesis, and orthoroentgenogram was superseded by computed tomography (CT) scanning.
(10) Indeed, by analogy with anti-hypertensive therapy, enzyme inhibitors could eventually supersede receptor antagonists for the treatment of acid-related diseases.
(11) Autoregulation graduates to wingless independence, but is transient, and is superseded by an engrailed-independent mode of maintenance.
(12) Early excision-graft of burned hands seems to have totally superseded the conventional method of progressive detorsion often with late grafting.
(13) Graphene is claimed by some as an innovation that will prove as revolutionary as the silicon chip, or even plastics, both of which it may supersede.
(14) Stupid, sadistic, public-school educated, a former Black and Tan and one-time professional strikebreaker in the United States, "wanted in New Orleans for the murder of a coloured woman", it's tempting to see him as a satirical portrait of the archetypal hero of the moribund thrillers that Ambler was so determined to supersede, unmasked and revealed for the cryptofascist brute he really is.
(15) If you are in this position, your rights also supersede what are commonly known as "squatters' rights".
(16) Streptomycin undoubtedly will be improved upon and superseded by some other agent in the future, giving us better control of this disease and possibly enabling us to eradicate it.
(17) The application of this combination of techniques supersedes the traditional approaches (gel filtration on polydextran gels, electrophoresis) in specificity and speed.
(18) People and companies are entitled to acquire and hold private assets, but there are times – as in the run-up to the Olympics, as in the period of urban reconstruction after the second world war – when the public good must supersede the rights of those who wish to retain and profit from private assets.
(19) It is designed as an objective system--superseding former weighting processes, which were influenced by ambition, prestige, prejudice and narrow politics--and has sufficient flexibility to accommodate both the anticipated and the unforeseen.
(20) The principle that the best management is resection and exteriorisation of the ends, which was developed in the early 1970s, has been superseded by the realisation that resection and primary anastomosis can be safe in a well-resuscitated infant in whom the bowel ends appear viable.