lento

As a verb lent

is past tense of lend.

As a proper noun Lent

is period of penitence for Christians before Easter.

As an adjective lento is

very slow.

As an adverb lento is

very slowly.

In lang=en terms the difference between lento and adagio

is that lento is very slowly while adagio is describing a passage having this mark.

As a noun adagio is

a tempo mark directing that a passage is to be played rather slowly, leisurely and gracefully.

In lang=en terms the difference between andante and lento

is that andante is describing a passage having this mark while lento is very slowly.

As a noun andante

is a tempo mark directing that a passage is to be played in a moderately slow tempo; faster than adagio but slower than allegretto.