also: ごごイチ
noun, adverb
first thing in the afternoon
Colloquial term used in business or daily conversation to refer to the very beginning of the afternoon, typically right after lunch or the start of the afternoon work period.
午後一で会議があります。
There's a meeting first thing in the afternoon.
午後一に電話します。
I'll call you first thing in the afternoon.
Compound of 午後 (afternoon) and 一 (one), literally 'afternoon one', referring to the first part of the afternoon.