1 to continue to have, use, remember etc; to keep in one’s possession, memory etc: He finds it difficult to retain information; These dishes don’t retain heat very well.
az: tutmaq, saxlamaq
ru: удерживать, сохранять
2 to hold (something) back or keep (something) in its place: This wall was built to retain the water from the river in order to prevent flooding.
az: qarşısını kəsmək, saxlamaq
ru: сдерживать