This was a hard defeat to take after having so much of the play. Stuart Golabek made his 200th appearance and Ross Tokely equalled Charlie Christie's club record when he played for the 314th time.
A huge crowd packed the stadium in the Spring sunshine and they saw the home side dominate for most of the game but fail to make the important breakthrough. The pressure on Aberdeen started in the first minute when Ryan Esson smothered the ball at Juanjo's feet then a Craig Brewster effort was deflected over the bar. Russell Duncan shot wide in 16 minutes, Barry Wilson did the same in 21 minutes then just after the half-hour mark a Brewster acrobatic effort was tipped over by Esson.
The resultant corner was delayed as Russell Anderson was treated for a facial injury then finally led from the field. The corner reached Roy McBain and his low shot rebounded to Juanjo whose strike from a few yards out was held by Esson.
Aberdeen were conspicuous by their attacking absence for most of this period apart from Noel Whelan's header over the bar in 24 minutes and Markus Heikkinen's high shot from 25 yards shortly after. The only goal of the game came in 39 minutes when a ball deflected off Grant Munro to the feet of Whelan who scored from 12 yards.
Half Time: 0-1
ICT were less impressive in the second half but they had chances as Aberdeen seemed content to sit on their lead. A long Munro throw on the hour mark was punched away by Esson and scrambled clear. A high cross from Tokely in 66 minutes was met by Brewster but his header went across goal and wide.
The closest Aberdeen came was in 74 minutes when a long throw from Richard Foster landed on the top of the bar. Substitute Bajram Fetai latched onto a Brewster flick in 79 minutes but his overhead kick was just off-target. Fetai had two close-range shots blocked close to the end before sub Bryan Prunty nearly equalised. A long Munro throw was headed on by Darren Dods and Brewster before Prunty headed goalwards. It looked net-bound but Esson popped up to push it onto the top of the bar. The last chance was gone and the Dons amazingly took the points.
Full Time: 0-1
With three games left before the split ICT remain eighth, 11 points clear of Dundee United in twelfth spot.
Inverness CT: 0
Team: Brown; Tokely, Dods, Munro, Golabek, Wilson, Hart (Fetai 57), Duncan, McBain (Bayne 83),
Juanjo (Prunty 71), Brewster
Subs not used: Fraser; McCaffrey, Proctor, Hastings - Booked: Golabek (42), Brewster (75)
Team: Esson; Hart, Anderson (McGuire 35), Diamond, Byrne, Winter (Foster 46), Severin, Heikkinen,
Clark, Mackie, Whelan (Blaha 73)
Subs not used: Preece; Stewart, Morrison, Muirhead - Booked: Clark (47), Whelan (60)
Attendance: 7026 - Referee: Alan Freeland