The 19-year-old from Bangalore, who is chasing a third Ladies European Tour title, carded seven birdies but dropped three shots to move to 15-under for the tournament, two ahead of Cheyenne Woods from the United States, who also shot 68.
England's Ellie Givens fired a flawless eight-under 64, just two shy of the women's course record set by Luna Sobron, to join overnight leader Lee-Anne Pace from South Africa in a share of third on 12-under.
On a day when temperatures once again hit 33 degrees centigrade, the 2016 Rookie of the Year quickly found her way to the top of the leaderboard.
"I was hitting it well on the range and I had a feeling that I could have a few birdie chances," said Aditi, who won back-to-back titles at last year's Indian and Qatar Opens.
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"It started out well and I was five-under on the front nine but there were a couple of mistakes on the back which could have been avoided. Four-under is still good. It's good that I have a two-stroke lead but there are several players within two or three shots and a low round is very possible on this course so I'll need to play well tomorrow."
"I'm very frustrated. I didn't think I played that badly but I left myself in some bad positions so decision-making wasn't the best, especially hitting over the green on 18 and dropping one there."
Givens, however, whose best finish to date on the LET is a tie for sixth in the 2013 Turkish Ladies Open, was delighted to move into contention for her first title.