ROI
- 1Initialism of return on investment.
Investors demanded a clear ROI before committing further capital.
The startup's marketing spend delivered an impressive ROI within six months.
Note
Accounting's version keeps both grammars of its full form. It works as a count noun (an impressive ROI, two ROIs) and as a mass noun (decisions driven by ROI), and the benefit it measures is usually, though not always, financial. It is spoken letter by letter, which is why it takes an rather than a. It also sits comfortably before another noun, as in ROI calculation.
- 2Initialism of Republic of Ireland.
Prices in the ROI are quoted in euros, not pounds.
Customs forms listed the parcel's origin as ROI.
Note
As a proper name it drops the article its full form needs. You write the Republic of Ireland, but simply ROI on a team sheet or a customs form, and unlike the noun senses it has no plural. The long form exists to name the state precisely, so its initials serve where the state must be kept distinct from Northern Ireland on the same island.
- 3Initialism of region of interest.
Analysts flagged the border crossing as a new ROI after the troop movements.
The satellite passed over the ROI twice each day.
Note
The same three words as the imaging term, moved from a slide to a map. Here region means a tract of land or sea, and the interest is strategic: an area under surveillance or military attention. The two never share a page in practice, so context alone tells them apart, and satellites pass over this kind while microscopes look into the other.
- 4Initialism of route of administration.
The label specified the recommended ROI as oral for adult patients.
Bioavailability varies sharply depending on the ROI chosen.
Note
Pharmacology's ROI answers the question of how a substance gets into the body: by mouth, through a vein, through the skin. The choice is not a formality. The same drug can be absorbed very differently by different routes, so bioavailability figures mean little until the route is stated. On labels and in prescribing it appears as a specification, such as an ROI given as oral.
- 5Initialism of region of interest.
The technician selected an ROI around the tumor before measuring its area.
Stacking each ROI from the serial sections produced a three-dimensional model of the specimen.
Note
A microscopist's working unit: the part of an image singled out so that measurement ignores everything around it. Region here is the plain geometric sense, a connected part of a surface. In reconstructions built from consecutive sections, the region is traced on each slice in turn, and the outlines are stacked to rebuild the specimen in three dimensions.
- 6Initialism of radius of influence.
The pumping test established an ROI of roughly thirty meters around the borehole.
Beyond the ROI, the drawdown in the aquifer was barely measurable.
Note
Engineering's ROI is a length, not an area. Radius is meant in its geometric sense, the distance out from a center, and in practice the center is often a pumping well or borehole. Because the letters more familiarly mean return on investment, writers usually attach a figure, as in an ROI of thirty meters, and the number makes clear which meaning is in play.
- 7Initialism of release of information.
Without a completed ROI, the agency could not forward the case notes to the new caseworker.
The parent signed an ROI authorizing the school to discuss the records with the therapist.
Note
In casework the letters often name a piece of paper rather than an act. An ROI is the consent form a client or parent signs so that records can pass to a school, a therapist or a new caseworker. That is why it keeps company with verbs like sign and complete. Release carries its sense of making something available, not of setting free.
Showing meanings only.
Practice
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