I = Italian, L = Latin, F = French, G = German, lit = Literally

I	a	at, to, by, for, in, in the style of
I	accelerando, accel.	gradually getting faster
I	adagietto	(I) rather slow, but faster than adagio
I	adagio	slow, (lit. "at ease"), generally held to indicate a tempo between andante and largo.
I	affettuoso	tenderly
I	affrettando, affret.	hurrying
I	agiato	agitated
I	al, alla	to the, in the manner of
I	allargando	broadening, i.e. getting a little slower and probably also a little louder
I	allegretto	fairly quick, but not as quick as allegro
I	allegro	quick (lit. "cheerful")
I	amabile	amiable, pleasant
I	amore	love
I	amoroso	loving
I	andante	at a walking pace (lit. "going"), indicating a medium speed
I	andantino	slightly faster than andante, but it can also mean slightly slower: the term is ambiguous
I	anima	soul, spirit
I	animando	becoming more lively
I	a piacere	at pleasure, meaning that the performer is not bound to follow the given rhythm exactly
I	appassionato	with passion
I	arco	bow of a string instrument, a direction after pizzicato
I	assai	very, extremely
F	assez	enough, sufficiently
I	a tempo	in time, indicating a return to the original speed after e.g rit., rall.
F	avec	with

I	calando	getting softer, dying away
I	calmato	calm, tranquil
I	cantabile	in a singing style
I	cantando	singing
I	capriccioso	in a whimsical, fanciful style
I	col, colla, colle	with, with the
I	come	as, similar to
I	con	with
I	crescendo, cresc.,cres.	gradually getting louder

I	da	from
I	da capo, D.C.	from the beginning
I	dal segno, D.S.	from the sign
I	deciso	with determination
I	decrescendo, decresc., decres.	gradually getting softer
I	delicato	delicate
I	diminuendo, dimin., dim.	gradually getting softer
I	divis, div.	divided, a direction to orchestral players (usu. strings) to divide into two or more groups
I	dolce	sweet, soft
I	dolcissimo, dolciss.	as sweetly as possible
I	dolente	sad, mornful
I	dolore	grief
I	doloroso	sorrowful
I	doppio movimento	twice as fast
I	duolo	= dolore = grief

I	f	- see forte -
I	facile	easy
I	felice	happy
I	feroce	fierce
I	fin	fine (I) end
I	flessivile	flexible, i.e not in strict tempo
I	forte, f	loud (fortissimo, ff, fff: very loud)
I	fortepiano, fp	loud, and then immediately soft
I	forza	force (forzando, forzato, fz: forcing, strongly accenting)
I	fretta	haste
I	fuoco	fire
I	furioso	furious, frenzied

G	gehend	at a steady speed (lit. "going"), equivalent to andante
I	giocoso	playful, humourous
I	giojoso	joyful, merry
I	giusto	proper, exact (tempo giusto: in strict time)
F	grave	very slow, solemn
I	grazioso	graceful

G	immer	always
I	impetuoso	impetuous
I	incalzando	getting quicker (lit. "pressing forward")

I	lacrimoso, lagrimando, lagrimoso	sad (lit. "tearful")
I	lamentoso	lamenting
G	langsam	slow, equivalent to adagio and lento
I	larghetto	rather slow, but slightly faster than largo
I	largo	slow, stately
I	legato	smooth (lit. "bound", "tied"), indicating no break between notes. (legatissimo: as smooth as possible)
G	leid	grief, pain
F	lent, lento	slow (lentement: slowly)
I	liberamente	freely
I	loco	at the normal pitch (used to cancel an 8va direction or to confirm that one is not intended)

I	m	- see main, mano, mezza -
I	ma	but
I	maestoso	majestic
F	main	hand
F	mais	but
I	mano	hand
I	mancando	fading away
I	marcato, marc.	emphatic, accented
I	martellato	strongly accented (lit. "hammered"), generally used in string music to denote a particular type of bowing, but can also be applied to music for piano or other instruments
I	meno	less
I	mesto	sad
I	mezza, mezzo	half (mezzo forte, mf: moderately loud; mezzo piano, mp: moderately soft. mezza voce: in an undertone)
I	misterioso	mysterious
I	misura	measure
I	moderato	at a moderate speed
I	molto	very, much
I	morendo	dying away
I	mosso	with motion, animated
I	moto, movimento	movement, motion
F	mouvement, mouvt	movement, motion

I	p	- see piano -
I	parlando	speaking, a direction to sing in a conversational style
I	patetico	with deep feeling, with pathos (NOT PATHETIC in the sense of feeble!!!)
I	pausa	a pause
I	pedale	pedal
I	pesante	heavy
I	piano, p	quiet (pianissimo, pp, ppp: very quiet)
I	piu	more
I	pizzicato, pizz.	plucked, a direction for plucking the strings of a bowed instrument
I	placido	calm, peaceful
F	plus	more
I	poco	little, slightly (poco a poco: little by little, gradually)

I	rallentando, rall.	gradually getting slower
G	rasch	quick (rascher: quicker)
I	rigoroso	bold, strong
I	ritardando, ritard., rit.	gradually getting slower
I	ritenuto, riten., rit.	held back
I	ritmico	rhythmically
I	rubato, tempo rubato	with some freedom of time (lit. "robbed")
G	ruhig	peaceful

I	scherzando, scherzoso	playful, joking, implies a fast speed)
I	semplice	simple, plain
I	sempre	always
I	senza	without
I	sforzando, sforzato, sfz, sf	accented, forced
I	simile, sim.	continue in the same way
I	smorzando, smorz.	dying away in tone and speed
I	solenne	solemn, grave
I	sostenuto, sost.	sustained
I	sotto	below, e.g., a direction for keyboard players to place one hand below the other
I	spiritoso	spirited
I	staccato, stacc.	detached, short (staccatissimo: very short)
I	stretto	quickening the speed (also means overlapping entries of a fugue subject)
I	subito, sub.	suddenly
I	sul, sulla	on the

I	tanto	so much
I	tempo	speed
I	tenuto, ten.	held
I	tranquillo	calm
G	traurig	sad
I	tremolando, tremolo, trem.	trembling, a direction for the rapid reiterations of a single note or alternations of different notes
I	troppo	too much

I	un, una, uno	one
G	und	and
I	unisono, unis.	in unison, with everyone performing the same notes, a direction to cancel divisions

I	veloce	swift
I	vibrato	vibrating
I	vif	lively
I	vigoroso	vigorous, strong
I	vite	quick
I	vivace	, vivement (F), vivo (I) lively, quick
I	voce	, voix (F) voice
I	volante	flying, fast
I	volta	time