8eb4e8a0_se_Security_Cooperation_Agency__Definition
[Term] Long-lead Items/Long-lead Time Materials [Link] N/A [Definition] 
Those components of a system or piece of equipment for which the times to design and fabricate are the longest, and therefore, to which an early commitment of funds may be desirable in order to meet the earliest possible date of system completion.
ESAMM Glossary | Defense Security Cooperation Agency
Definition