What's the difference between consider and forethink?

Consider

Definition:

(v. t.) To fix the mind on, with a view to a careful examination; to think on with care; to ponder; to study; to meditate on.
(v. t.) To look at attentively; to observe; to examine.
(v. t.) To have regard to; to take into view or account; to pay due attention to; to respect.
(v. t.) To estimate; to think; to regard; to view.
(v. i.) To think seriously; to make examination; to reflect; to deliberate.
(v. i.) To hesitate.

Example Sentences:

(1) Anti-Leu 7 could not be considered as a specific marker for oligodendroglioma.
(2) Life expectancy and the infant mortality rate are considered more useful from an operational perspective and for comparisons than is the crude death rate because they are not influenced by age structure.
(3) We considered the days of the disease and the persistence of symptoms since the admission as peculiar parameters between the two groups.
(4) Coronary arteritis has to be considered as a possible etiology of ischemic symptoms also in subjects who appear affected by typical atherosclerotic ischemic heart disease.
(5) Structural peculiarities in tubulin polymorphism are considered.
(6) To be fair to lads who find themselves just a bus ride from Auschwitz, a visit to the camp is now considered by many tourists to be a Holocaust "bucket list item", up there with the Anne Frank museum, where Justin Bieber recently delivered this compliment : "Anne was a great girl.
(7) The dependence of fluorescence polarization of stained nerve fibres on the angle between the fibre axis and electrical vector of exciting light (azimuth characteristics) has been considered.
(8) In choosing between various scanning techniques the factors to be considered include availability, cost, the type of equipment, the expertise of the medical and technical staff, and the inherent capabilities of the system.
(9) In the past 6 years 26 patients underwent operation for recurrent duodenal ulcer after what was considered to be an "adequate" initial operation.
(10) External exposures to a contaminated fishing net and fishing boat are considered pathways for fishermen.
(11) This paper has considered the effects and potential application of PFCs, their emulsions and emulsion components for regulating growth and metabolic functions of microbial, animal and plant cells in culture.
(12) Formerly, many patients in this category were considered either inoperable or candidates for total or partial nephrectomy.
(13) A re-examination of the literature indicates that many phagocytes previously unidentified or considered to be microglial cells are probably beta astrocytes.
(14) Implications of the theory for hypothesis testing, theory construction, and scales of measurement are considered.
(15) The Bohr and Root effects are absent, although specific amino acid residues, considered responsible of most of these functions, are conserved in the sequence, thus posing new questions about the molecular basis of these mechanisms.
(16) BPH patients may be considered as "endocrinologically younger" than healthy subjects.
(17) Eight other children (20%) had normal or borderline elevation of CPK-MB fraction and EKG abnormalities combined with abnormal echocardiograms or radionuclide angiograms, and were considered to have sustained cardiac concussion.
(18) The pathogenicity of Mycoplasma pneumoniae in atypical pneumonias can be considered confirmed according to the availabile literature; its importance for other inflammatory diseases of the respiratory tract, particularly for chronic bronchitis, is not yet sufficiently clear.
(19) The cause has been innumerable "VIP movements", as journeys undertaken by those considered important enough for all other traffic to be held up, sometimes for hours, are described in South Asian bureaucratic speak.
(20) HDAra-C in combination with anthracyclines is now considered to be a treatment which may afford some hope of a cure in a certain percentage of cases of adult acute non-lymphocytic leukemia.