the only time it's pronounced this way is in the definition Mav posted No; in M-W, it's the pronunciation given for:

Main Entry: 4second
Function: transitive verb
Etymology: Latin secundare, from secundus second, favorable
1 a : to give support or encouragement to : ASSIST b : to support (a fighting person or group) in combat : bring up reinforcements for
2 a : to support or assist in contention or debate b : to endorse (a motion or a nomination) so that debate or voting may begin
3 /si-'känd/ chiefly British : to release (as a military officer) from a regularly assigned position for temporary duty with another unit or organization
- sec·ond·er noun

Trying the link one more time:
http://www.m-w.com/cgi-bin/dictionary