the basic definition of 'invitation' as a noun is a request for someone to be present or participate in a particular event, activity, or celebration. An invitation can be issued verbally, but it is usually delivered in written form or extended electronically. The person or party extending the invitation is known as the host.
when 'invitation' is used as a noun, the associated rules and use cases revolve around how to deliver the invitation. This includes when it should be issued, who should receive it, and what should be included on the invitation. Depending on the event, the invitation can be as formal or informal as desired.
1. We sent out the invitation for the party and now we're just waiting for the RSVPs.
2. I received a very formal invitation to attend the wedding.
3. She wanted to make sure that everyone who was invited to the BBQ received the invitation.
when used as a noun, 'invitation' is always preceded by an article (the, an, etc.) and is typically followed by an adverb or preposition, such as 'for,' 'to,' or 'from.' It is also important to keep the tone and formality of the invitation in mind when extending or accepting it.