What does "sent" mean?

1. (past form of send) the past tense of 'send' — you use this when you already gave or mailed something to someone. 2. (Estonian currency) a small unit of money used in Estonia before they started using the Euro.

Is it correct to say "I have send the email already."?

No — say "I have sent the email already.". The past participle of 'send' is 'sent', not 'send'.

sent

v. · n.

US //ˈsɛnt// UK //sˈɛnt// sent

1 past form of send (v.)
A1 Beginner

the past tense of 'send' — you use this when you already gave or mailed something to someone.

the simple past and past participle of the transitive verb 'send'.

Example

I sent you a text message an hour ago, but you didn't reply.

Example

The logistics department sent the final shipment yesterday, ensuring that the client would receive the materials before the weekend deadline.
- received
Pitfall

I have send the email already.

I have sent the email already.

The past participle of 'send' is 'sent', not 'send'.
2 Estonian currency (n.)
C2 Proficiency Archaic

a small unit of money used in Estonia before they started using the Euro.

a former subdivision of the Estonian kroon, representing one hundredth of the unit.

Example

The old Estonian coin was worth only a few sent.

Example

Before the adoption of the Euro, the sent served as the fractional currency of Estonia, though its purchasing power was minimal by the late 1990s.
- cent

Etymology 1

From send + -t. See send.

Etymology 2

From Estonian sent. Doublet of cent.

Etymology 3

See scent.