"Inquorate" is an adjective used to describe a meeting, legislative session, etc. that doesn't have enough people in attendance to get anything valid done by its own rules; in other words, it doesn't have a quorum. Inquorate and its opposite, quorate, are relatively recent coinages; the Oxford English Dictionary records neither before 1969, though the Latin borrowing "quorum" has been used in English since the 1400s. However, "inquorate" seems to be a convenient word to use in summaries of the minutes of meetings; a scan of the Google search results for the word reveals a high percentage of .uk domain names, with a sprinkling of .au and .za, so perhaps the word has not caught on among the meeting-holders of the United States yet.