What does l-masīḥu in Qur'an Surah Imran 3:45 mean?

According to Jewish and Christian understanding, the Messiah will establish justice on Earth and rule the entire world while being from the lineage of King David, peace be upon him. However I've seen that Zaydis do not believe Prophet Isa, peace be upon him, will return to Earth to do this and that the hadiths regarding this are not reliable. What then does "l-masīḥu" mean exactly?
 

as-salamu alaikum,

Shaykh al-Islam al-Hakim al-Jushami -radiyallahu anh- said in his famous Tafsir al-Tahzib fi al-Tafsir:

Al-Masīḥ (the Messiah):
The word Masīḥ is on the morphological pattern faʿīl with the meaning of mafʿūl (i.e., “one who is anointed”).
Its root is masḥ, meaning “to wipe” that is, he was wiped (anointed) and purified from impurities.
Masḥ means to pass the hand over something.

A Masīḥ can also refer to a person whose one side of the face is smoothed out, having no eye or eyebrow hence the Dajjāl (Antichrist) is called al-Masīḥ for that reason.

As for ʿĪsā (Jesus), he is called al-Masīḥ with an open mīm, a kasrah on the sīn, and light (non-doubled) pronunciation.
The Dajjāl’s Masīḥ is pronounced with a kasrah on the mīm and a doubled sīn, like mussīḥ, on the pattern of shirrīr (“evil”) and fasīq (“depraved”).

The poet said:

“When the true Messiah kills the false messiah.”

It has also been said that Masīḥ is an Arabized form of a non-Arabic word.

“His name is the Messiah”:
It is said he was called al-Masīḥ because:

He was anointed with blessing and grace (al-Ḥasan, Saʿīd),

or because he was purified from sins,

or because he was anointed with the oil customarily used for prophets (Abū ʿAlī),

or because Gabriel wiped him with his wing at birth, as protection from Satan,

or because he used to wipe (touch) the sick and heal them, wipe the dead and they came to life, wipe the blind and they saw thus Masīḥ is faʿīl meaning fāʿil (active),

or because he wiped the heads of orphans in mercy,

or because he used to wipe the earth and sit upon it humbly,

or because he wandered the earth without settling (from sāḥa “to travel”), in which case the mīm is extra,

or because he was born already smoothed (mamsūḥ),

or, according to Abū ʿAmr ibn al-ʿAlāʾ, because Masīḥ means “king.”

Ibrāhīm said: it means “the truthful one.”
ʿĪsā ibn Ibrāhīm said: “ʿĪsā is his name, and al-Masīḥ is his title which he became known by.”

He is called ʿĪsā ibn Maryam (Jesus son of Mary) in refutation of the Christians’ claim that he is the son of God.

[END OF QUOTE]

Imam Badr al-Din Ibn Amir al-Din al-Huthi -alayhi as-salam- said this in his Taysir al-Tafsir:

“And {al-Masīḥ} (the Messiah) is a title for him (Jesus, peace be upon him), which the Arabs adopted due to its widespread usage.

It is likely that the Arabs did not know its original meaning in Hebrew, nor that its original form in his people’s language was Mashīaḥ (Messiah).

Therefore, it is not necessary to interpret al-Masīḥ in any particular way it suffices that it is simply a title for ʿĪsā (Jesus), peace be upon him.”

wa salam