n.
Pronunciation: tr ə - ' jek-t( ə -)r ē
Function: noun
Inflected Form: plural -ries
Etymology: New Latin trajectoria, from feminine of trajectorius of passing, from Latin traicere to cause to cross, cross, from trans-, tra- trans- + jacere to throw ― more at JET
Date: 1696
1 : the curve that a body (as a planet or comet in its orbit or a rocket) describes in space
2 : a path, progression, or line of development resembling a physical trajectory <an upward career trajectory >