(a.) Ancient; pertaining to the earliest period in geological history.
(n.) The earliest period in geological period, extending up to the Lower Silurian. It includes an Azoic age, previous to the appearance of life, and an Eozoic age, including the earliest forms of life.
Example Sentences:
(1) We formulate the following hypothesis: Life's origin may have occurred during the lower Archaean at a time when the environmental temperature was higher than it is at present.
(2) Hence, the occurrence of sulfate evaporites in Archaean sediments does not necessarily provide testimony of oxidation weathering on the ancient continents and, consequently, of the existence of an atmospheric oxygen reservoir.
(3) Incipient minor differentiation of the isotope pattersn notably of Archaean sulfates may be accounted for by photosynthetic sulfur bacteria rather than by sulfate reducers.
(4) (2) Isotopic evidence of dissimilatory sulfate reduction is first observed in the upper Archaean of the Aldan Shield, Siberia (approximately 3.0 x 10(9) yr) and in the Michipicoten and Woman River banded iron formations of Canada (2.75 x 10(9) yr).
(5) The presently available sedimentary sulfur isotope record for the Precambrian seems to allow the following conclusions: (1) In the Early Archaean, sedimentary delta 34S patterns attributable to bacteriogenic sulfate reduction are generally absent.
(6) (4) With the bulk of sulfate in the Archaean oceans probably produced by photosynthetic sulfur bacteria, the accumulation of SO4(2-) in the ancient seas must have preceded the buildup of appreciable steady state levels of free oxygen.
Era
Definition:
(n.) A fixed point of time, usually an epoch, from which a series of years is reckoned.
(n.) A period of time reckoned from some particular date or epoch; a succession of years dating from some important event; as, the era of Alexander; the era of Christ, or the Christian era (see under Christian).
(n.) A period of time in which a new order of things prevails; a signal stage of history; an epoch.
Example Sentences:
(1) "In my era, we'd get a phone call from John [Galliano] before the show: this is what the show's about, what do you think?
(2) After the emperor's death, they are named after an era chosen for them; thus Hirohito is known exclusively in Japan as Showa Emperor.
(3) The viral titer was 10(1.8) tissue culture infective doses (TCID) higher than that of commercial ERA vaccine.
(4) Thanks to the groundbreaking technology and heavy investment of a new breed of entertainment retailers offering access services, we are witnessing a revolution in the entertainment industry, benefitting consumers, creators and content owners alike.” ERA acts as a forum for the physical and digital retail sectors of music, and represents over 90% of the of the UK’s entertainment retail market.
(5) We have now entered the era of climate change induced loss and damage.
(6) In an era when citizens expect choice, the council argue, the old model of local government no longer works.” Northants uses the word “right-sourcing” to describe the process of offloading services.
(7) He is seeing clubbers with their hands in the air again: "In the dubstep era everyone just stood there and nodded their heads.
(8) In an article for the Nation, Chomsky courts controversy by arguing that parallels drawn between campaigns against Israel and apartheid-era South Africa are misleading and that a misguided strategy could damage rather than help Israel's victims.
(9) Russia may be on the point of walking out of a major cold war era arms-control treaty, Russian analysts have said, after President Obama accused Moscow of violating the accord by testing a cruise missile .
(10) This deal also promotes the separation of the single market and single currency – a British objective for many years that would have been unthinkable in the Maastricht era.
(11) The new era of medical economics emphasizes prospective payment and alternative delivery systems.
(12) Once availed of the fallacy that athletes are role models, there’s a certain purity that feels almost quaint in an era of athlete as brand.
(13) A “shock to the system” is precisely how his adviser Kellyanne Conway has repeatedly described the new era.
(14) So the worst start to a campaign in the Roman Abramovich era has condemned Chelsea to the top of the Premier League table.
(15) The report’s concluding chapters raised dire warning that the operations of contemporary child protection agencies were replicating many of the destructive dynamics of the Stolen Generations era.
(16) The modern era of leg lengthening has therefore brought two things: new technical versatility to correct complex and coexisting deformities and new concepts of the biology of lengthening that are not device specific and can be applied with most lengthening devices.
(17) Pallo Jordan , the ANC's chief propagandist in exile during the apartheid era, made no effort to hide his emotions.
(18) These infections must have been more common in the pre-antibiotic era and perhaps a search of the older literature would have been more fruitful.
(19) In 1994, he appeared as himself in the television special Smashey and Nicey, the End of an Era.
(20) The club’s increase in capacity from 35,000 at the Boleyn Ground to 60,000 at the former Olympic Stadium also makes it the biggest and most successful stadium move in Britain in the modern era.” The club’s vice-chairman, Karren Brady, added: “David Sullivan, David Gold and I have always believed in the West Ham fanbase and knew we could fill the new stadium “Reports consistently show that we have highest average capacity in the Premier League and every game in our final season at the Boleyn Ground sold out within days of going on sale.