Both Uses of

lament
in
Great Expectations

The apparition of a file of soldiers ringing down the but-ends of their loaded muskets on our door-step, caused the dinner-party to rise from table in confusion, and caused Mrs. Joe re-entering the kitchen empty-handed, to stop short and stare, in her wondering lament of "Gracious goodness gracious me, what's gone—with the—pie!"†
p. 30.2 *

lament = express grief or regret

We were waiting, I supposed, for Mr. Pocket to come out to us; at any rate we waited there, and so I had an opportunity of observing the remarkable family phenomenon that whenever any of the children strayed near Mrs. Pocket in their play, they always tripped themselves up and tumbled over her,—always very much to her momentary astonishment, and their own more enduring lamentation.†
p. 196.2

lamentation = passionate expression of grief or sorrow

Definitions:

(1) (lament)
to express grief or regret
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Although lament typically refers to a feeling or simple vocal expression, it can refer to a vocal expression as complex as a sad song or poem. It can even refer to sad, but non-vocal music -- as when Tennessee Williams references background music in A Streetcar Named Desire.