待って is the te-form of 待つ

1. Godan verb with 'tsu' ending, Transitive verb, Intransitive verb

   to wait

   しばらく電話を切らずにお待ちください。

2. to await; to look forward to; to anticipate

3. to depend on; to need

   usu. in negative form

Also written 俟つ【まつ】matsu