A flowering plant whose embryo has one cotyledon. Examples are cereals (corn, wheat, rice etc.), banana, and lily. (FAO Glossary of Biotechnology for Food and Agriculture, 2001)
The cultivation or growth of only one agricultural product in a given area (field, farm, garden, forest). (Aizen, M.A., Basu, P. , Bienefeld, K., Biesmeijer, J.C., Garibaldi, L.A., Gemmill-Herren, B, Imperatriz-Fonseca, V.L., Klein, A-L., Potts, S.G., Seymour C.L. & Vanbergen, A.J. 2023. Sustainable use and conservation of invertebrate pollinators. Background Study Paper, No. 72. Commission on Genetic Resources for Food and Agriculture. Rome, FAO.)
Note
Cultivation of a single crop to the exclusion of other uses of land