Macte animo! Generose puer sic itur ad astra
Young, cheer up! This is the way to the skies.

Macte virtute sic itur ad astra
those hwo excel, thus reach the stars

Magister dixit
the teacher has said it

Magister meus Christus
Christ is my teacher

Magna Carta
Great Charter

Magna cum laude
with great praise

Magna di currant, parva neglegunt
The gods care about great matters, but they neglect sall ones

Magna est vis conseuetudinis
great is the power of habit

Magno cum gaudio
with great joy

Magnum opus
great work

Magnum vectigal est parsimonia
Economy is a great revenue

Maior e longinquo reverential
greater reverence from afar

Maiora premunt
greater things are pressing

Mala fide
in bad faith

Mala Ipsa Nova
Bad News Itself

Mala tempora currunt
bad times are upon us

Male captus bene detentus
wrongly captured, properly detained

Malo mori quam foedari
Death rather than dishonour

Malo pereiculosam libertatem quam quietum servitium
I prefer liberty with danger to peace with slavery

Malum discordiae
apple of discord

Malum in se
wrong in itself

Malum prohibitum
wrong due to being prohibited

Malum quo communius eo peius
the more common an evil is, the worse it is

Manu forte
literally translated means 'with a strong hand', often quoted as 'y strength of hand'

Minibus date lilia plenis
give lilites with full hands

Manu militari
with a military hand

Manu propria
with one's own hand

Manus manum lavat
one hand washes the other

Manus multae cor unum
many hands, one heart

Manus nigra
black hand

Market sine adversario virtus
valor becomes feeble without an opponent

Mare clausum
Closed sea

Mare Ditat, Rosa Decorat
The sea enriches, the rose adorns

Mare liberum
free sea

Mare nostrum
our sea

Mater dei
mother of God

Mater familias
the mother of the family

Mater semper certa est
the mother is always certain

Materia medica
Medical matter

Maxima debetur puero reverential
Greatest deference is owed to the child

Me vexat pede
it annoys me at the foot

Mea culpa
through my fault

Media vita in morte sumus
In the midst of our lives we die

Meliora
better things

Meliorare legem meliorare vitam est
To improve the law is to improve life

Meliorem lapsa locavit
He has planted one better than the one fallen

Melita, domi adsum
Honey, I'm home

Memento mori
remember that [you will] die

Memento vivere
remember to live

Meminerunt omnia amantes
lovers remember all

Memores acti prudentes future
mindful of things done, aware of things to come

Mens agitat molem
the mind moves the mass

Mens et manus
mind and hand

Mens rea
guilty mind

Mens sana in corpore sano
a sound mind in a sound body

Metri causa
for the sake of the metre

Miles gloriosus
Glorious Soldier

Mictus cruentus
bloody urine

Minatur innocentibus qui parcit nocentibus
he threatens the innocent who spares the guilty

Mirabile dictum
wonderful to tell

Mirabile visu
wonderful to see

Mirum videtur quod sit factum iam diu
Does it seem wonderful [merely] because it was done a long time/so long ago?

Miscreique probat populous et foedera jungi
He approves of the mingling of the peoples and their bonds of union

Misera est servitus ubi jus est aud incognitum aut vagum
miserable is the state of slavery in which the law is unknown or uncertain

Miserabile visu
terrible to see

Miserere nobis
have mercy upon us

Mission dei
the mission of God

Missit me dominus
the lord has sent me

Mittimus
we send

Mobilis in mobile
"moving in a moving thing"

Modus operandi
method of operating

Modus ponens
method of placing

Modus Tollens
method of removing

Modus vivendi
method of living

Monasterium sine libris est sicut civitas sine opibus
a monastery without books is like a city without wealth

Montani semper liberi
Mountaineers [are] always free

More ferarum
Like beasts

Morior invictus
I die unvanquished

Morituri nolumus mori
we who are about to die don't want to

Morituri te salutant
those/we who are about to die salute you

Mors certa, hora incerta
death is certain, its hour is uncertain

Mors mihi lucrum
death to me is reward

Mors omnibus
death to all

Mors tua, vita mea
your death, my life

Mors vincit omnia
"death conquers all"
or
"death always wins"

Morte magis metuenda senectus
old age should rather be feared than death

Mortui vivos docent
The dead teach the living

Mortuum glagellas
You are flogging a dead

Mos maiorum
the custom of our ancestors

Motu proprio
on his own initiative

Mulgere hircum
to milk a male goat

Mulier est hominis confusion
woman is man's ruin

Multa paucis
say much in few words

Multis e gentibus vires
from many peoples, strength

Multitude sapientium sanitas orbis
a multitude of the wise is the health of the world

Multum in parvo
much is little

Mundus senescit
the world grows old

Mundus vult decipi
the world wants to be deceived

Mundus vult decipi, ergo decipiatur
the world wants to be deceived, so let it be deceived

Munit haec et altera vincit
this one defends and the other one conquers

Mutatis mutandis
after changing what needed to be changed

Mutate nomine de te fabula narrator
change but the name, and the story is told of yourself.