tuesday

Q: Is it correct to say "I will see you in Tuesday."?

No — say "I will see you on Tuesday.". Specific days of the week require the preposition 'on' rather than 'in'.

Definition

n. the day of the week that comes after Monday and before Wednesday.

n. the third day of the week in some religious calendars, or the second day of the working week in most international standards.

simple

“We have a team meeting every Tuesday morning.”

contextual

“Since the museum is closed on Mondays, we decided to visit on Tuesday instead.”

complex

“The project deadline falls on the first Tuesday of next month, so we must finalize the draft by the end of this week.”

Capitalized in all contexts. When used to describe a recurring event, it can be pluralized or used with 'on' plus the singular form.

I will see you in Tuesday.

I will see you on Tuesday.

Specific days of the week require the preposition 'on' rather than 'in'.

From Middle English Tewesday, from Old English tīwesdæġ (“Tuesday”), from Proto-West Germanic *Tīwas dag (“Tuesday”, literally “Tiw's Day”). This was a Germanic interpretation of Latin diēs Mārtis, itself a translation of Ancient Greek Ἄρεως ἡμέρα (Áreōs hēméra) (interpretatio romana). Cognate with Scots Tysday (“Tuesday”), Saterland Frisian Täisdai (“Tuesday”), West Frisian tiisdei (“Tuesday”), dialectal German Ziestag (“Tuesday”), Danish tirsdag (“Tuesday”), Swedish tisdag (“Tuesday”), Finnish tiistai (“Tuesday”). More at Tyr, day.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.