case, casing, door, doorcase, doorframe, doorsill, doorstep

level, limit, minimum, criterion, requirement, rubicon, maximum, rate, cutoff, benchmarks, standards, mark, plateau, target, norm, barrier, guideline, trigger, parameters, deciliter, borderline, minium, poverty level, hurdle, probability, midpoint, average, poverty line, deadline, donee, ceiling, incomes, prerequisites, limitation, sliding scale, surtax, zero, milestone, subthreshold, definition, redline, peak, measure, numerosity, minimum wage, subgroup, quotas, aminotransferase, kurtosis, boundaries, rfd, dma, deduction, precondition, quotient, total, degression, microampere, becquerel, zenith, disutility, asymptote, fibonacci, standard deviation, restriction, price, resistance, nadirs, leve, likelihood, percentile, retest, cubic millimeter, paygrade, skewness, illuminance, orbital velocity, systolic pressure, logarithmic scale, decibel, tolerance, rules, prevision, microliter, watermark, increment, heights, median, age, registers, apogee, bracket, celestial equator, litmus test, null hypothesis, nanogram, perquisite, surcharge, neckline, specificity, stratum, inquorate, thresholds, temperature, frequency, q, tc, altitude, optimum, rale, input, levels, ranking, ratio, value, values, effect, saturation, stream, gradient, strength, acoustic, equivalent, estimated, expectancy, geostrophic, glycemic, homeostatic, hydromagnetic, ic, multiplier, negative, postulated, semantic, static

absolute threshold, difference limen, difference threshold, differential limen, differential threshold, exterior door, outside door

majority operation, sone, subliminal, threshold element, threshold function, threshold gate, threshold operation

doorway, room access, wall

beginning, bound, boundary, commencement, edge, entrance, entranceway, entree, entry, entryway, first, kickoff, offset, outset, sensation, sense datum, sense experience, sense impression, sill, start, starting time

brink, limen, verge