Define first base dating
basis more often refers to a figurative support: the basis of a report.
foundation implies a solid, secure understructure.1. Chemistry Any of a class of compounds that contain hydroxyl ions (OH) and are capable of neutralizing acids in solution.
Medical professionals use a standard set of up to three methods to date pregnancies: last menstrual period, ultrasound, and a physical exam.
That way, regardless of where they trained or where they practice, any two doctors dating a pregnancy will predict the same due date or gestational age.
They react with acids and certain metals to form water and salts.
Bases turn red litmus paper blue, have a bitter taste, and have a p H of greater than 7. A locality from which operations are projected or supported.2. See also base of operations; facility.armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker"structure, construction - a thing constructed; a complex entity constructed of many parts; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"home base, home plate, plate, home - (baseball) base consisting of a rubber slab where the batter stands; it must be touched by a base runner in order to score; "he ruled that the runner failed to touch home"base pair - one of the pairs of chemical bases joined by hydrogen bonds that connect the complementary strands of a DNA molecule or of an RNA molecule that has two strands; the base pairs are adenine with thymine and guanine with cytosine in DNA and adenine with uracil and guanine with cytosine in RNAcomponent part, part, portion, component, constituent - something determined in relation to something that includes it; "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton"Base - a terrorist network intensely opposed to the United States that dispenses money and logistical support and training to a wide variety of radical Islamic terrorist groups; has cells in more than 50 countriesact of terrorism, terrorism, terrorist act - the calculated use of violence (or the threat of violence) against civilians in order to attain goals that are political or religious or ideological in nature; this is done through intimidation or coercion or instilling fear Afghanistan, Islamic State of Afghanistan - a mountainous landlocked country in central Asia; bordered by Iran to the west and Russia to the north and Pakistan to the east and south; "Soviet troops invaded Afghanistan in 1979"Islamic Republic of Pakistan, Pakistan, West Pakistan - a Muslim republic that occupies the heartland of ancient south Asian civilization in the Indus River valley; formerly part of India; achieved independence from the United Kingdom in 1947descriptor, form, signifier, word form - the phonological or orthographic sound or appearance of a word that can be used to describe or identify something; "the inflected forms of a word can be represented by a stem and a list of inflections to be attached"base - the principal ingredient of a mixture; "glycerinated gelatin is used as a base for many ointments"; "he told the painter that he wanted a yellow base with just a hint of green"; "everything she cooked seemed to have rice as the base"situate, locate - determine or indicate the place, site, or limits of, as if by an instrument or by a survey; "Our sense of sight enables us to locate objects in space"; "Locate the boundaries of the property"base - not adhering to ethical or moral principles; "base and unpatriotic motives"; "a base, degrading way of life"; "cheating is dishonorable"; "they considered colonialism immoral"; "unethical practices in handling public funds"base - having or showing an ignoble lack of honor or morality; "that liberal obedience without which your army would be a base rabble"- Edmund Burke; "taking a mean advantage"; "chok'd with ambition of the meaner sort"- Shakespeare; "something essentially vulgar and meanspirited in politics"ignoble - completely lacking nobility in character or quality or purpose; "something cowardly and ignoble in his attitude"; "I think it a less evil that some criminals should escape than that the government should play an ignoble part"- Oliver Wendell Holmes, Jr.dishonourable, evil, corrupt, infamous, disgraceful, vulgar, shameful, vile, immoral, scandalous, wicked, sordid, abject, despicable, depraved, ignominious, disreputable, contemptible, villainous, ignoble, discreditable, scungy (Austral.
The body is not on a clock counting down to delivery; natural variation will introduce uncertainty.
The average time between menstrual periods is about 28 days, and ovulation occurs about 14 days before the next period begins.
Trimesters, however, have a variability of a few weeks, so they should be thought of as general benchmarks.
The first trimester is generally considered to comprise the time up to 12 or 14 weeks from the LMP.
Basis is used in a nonphysical sense: "Healthy scepticism is the basis of all accurate observation" (Arthur Conan Doyle).
Foundation often stresses firmness of support for something of relative magnitude: "Our flagrant disregard for the law attacks the foundation of this society" (Peter D. Ground is used figuratively, especially in the plural, to mean a justifiable reason: grounds for divorce.
An area or locality containing installations which provide logistic or other support.