(US, education) The period in school that comes after first grade and before third grade.

Of high quality, particularly good.

(education) A letter of the alphabet assigned as an evaluation of schoolwork, with A generally being the best. Passing grades may also carry a plus or minus sign, with an A-minus (A-) better than B-plus (B+) and so on.

(often attributive) A standard of purity suitable for medicinal use.

(US, rarely Canada, education) An elementary school or primary school

(idiomatic) To prove satisfactory; to be successful or worthy of merit.

Of inferior quality.

(US, education) The first year of grade school, the period in school that comes after kindergarten and before second grade. Children usually begin first grade at age six.

Alternative spelling of low-grade

(chiefly US) An at-grade crossing between a railroad line and an ordinary road, with tracks and road at the same level.