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The Collaborative International Dictionary
At grade

Grade \Grade\ (gr[=a]d), n. [F. grade, L. gradus step, pace, grade, from gradi to step, go. Cf. Congress, Degree, Gradus.]

  1. A step or degree in any series, rank, quality, order; relative position or standing; as, grades of military rank; crimes of every grade; grades of flour.

    They also appointed and removed, at their own pleasure, teachers of every grade.
    --Buckle.

  2. In a railroad or highway:

    1. The rate of ascent or descent; gradient; deviation from a level surface to an inclined plane; -- usually stated as so many feet per mile, or as one foot rise or fall in so many of horizontal distance; as, a heavy grade; a grade of twenty feet per mile, or of 1 in 264.

    2. A graded ascending, descending, or level portion of a road; a gradient.

  3. (Stock Breeding) The result of crossing a native stock with some better breed. If the crossbreed have more than three fourths of the better blood, it is called high grade.

    At grade, on the same level; -- said of the crossing of a railroad with another railroad or a highway, when they are on the same level at the point of crossing.

    Down grade, a descent, as on a graded railroad.

    Up grade, an ascent, as on a graded railroad.

    Equating for grades. See under Equate.

    Grade crossing, a crossing at grade.

Wiktionary
at grade

a. (alternative form of at-grade English)

Usage examples of "at grade".

Igor Beaver, the graduate student, looked up in astonishment: The seismograph stood at grade 5.

There are many people of much greater ability in the world, but you don't read about them in the headlines and you don't run to gape at them at grade crossings—.

I went on kleptomaniacal missions and sulked, skulked and nazifled my way through a second pass at grade 11.

The old tracks crossed River Street at grade, and at once veered off into a region increasingly rural and with less and less of Innsmouth's abhorrent fishy odour.

The way that I, from my earliest memories, had tried to be better than everyone, at grade school, at sports, with girls, in college--organic chemistry!