The phrase "second quarter" refers to a specific period of time that lasts for three months. It is commonly used to represent the second part of the year divided into four equal portions. Full definition
It will arrive at the selected dealerships in early second quarter of 2017. (car24news.com)
In second quarter release management said that the joint venture is progressing on schedule with production to start next year. (alexbossert.com)
Second quarter results in the residential market show a 3.9 per cent decrease in sales from the same quarter last year, but a 4.6 per cent increase in average sale price. (rahb.ca)