invite  v.

I willinvite 10 friends to my birthday party.

 (invite sb to a party, meeting…)

They have invited me  to go to Beijing with them.

(invitesb to do sth)

invitation  

/ˌɪnvɪˈteɪʃn/

I got abirthday party invitation from Sofia.

Ireceived an invitation from Sofia.

I gottheir invitation to go to Beijing with them.

We have already sent out the invitations. (not ‘invitationcards’)

I received the invitation letter to themeeting.

-ion，-tion，-sion

act         action 

quest      question

invent     invention

locate      location

inform         information

converse    conversation

decide         decision  /dɪˈsɪʒn/

explode        explosion

discuss         discussion  /dɪˈskʌʃn/

permit          permission

submit         submission