2. To precipitate water from the clouds: It rains at least three times a week in the rain forest.
When you have spoken the word, it reigns over you. When it is unspoken, you reign over it.
Throughout the reigns of the great lords, the members of parliament have held the reins of power and a sense of peace and security rains throughout the land.
Any kind of precipitation or fog water having a pH less than 5.65 is termed to be acid rain.
Acid rain is the deposition of acidifying substances from the atmosphere during an event of precipitation.

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It can be wet precipitation (rain, snow, or fog) or dry precipitation (absorbed gaseous and particulate matter, aerosol particles or dust).
Acid rain has a pH below 5.6. Normal rain has a pH of about 5.6, which is slightly acidic. The term pH is a measure of acidity or alkalinity and ranges from 0 to 14.
A pH measurement of 7 is regarded as neutral. Measurements below 7 indicate increased acidity, while those above indicate increased alkalinity.