Ad-hoc这个词来源于拉丁语，在百度上解释为“for this purpose only”，
在wiki上解释为“for this”，其中文在wiki上被解释成包含“特设的、特定目的的（地）、即席的、临时的、将就的、专案的”这么多种含义。
在wireless network中，ad-hoc network是网络的一种工作模式，如802.11权威指南中所述，其可以理解成”为了某个特定目的，所建立起来的临时网络“，也可以直接像wiki中解释成特定网络，也可以按照wireless ad hoc network (WANET)这样的理解，翻译成无线自组织网络，这里强调自组织，主要是在于ad-hoc网络不是一种中心式的网络，对比基础架构式网络的情况，其中存在一个AP是作为中心节点的（其功能为充当一个cell），而ad-hoc模式下，就没有这个中心节点。
Question
What does ad hoc mean? What is its usage? –Hong, Vietnam
Answer
Ad hoc is a word that originally comes from Latin and means “for this” or "for this situation." In current American English it is used to describe something that has been formed or used for a special and immediate purpose, without previous planning.
Ad hoc can be used as an adjective or an adverb. It is used more often as an adjective, especially in these expressions:
- ad hoc committee
- ad hoc group
- ad hoc basis
Below are some example sentences with ad hoc that help illustrate its meaning:
ad hoc used as an adjective
- The mayor appointed an ad hoc committee to study the project.
- We had to make some ad hoc changes to the plans.
- We'll hire more staff on an ad hoc basis.
ad hoc used as an adverb
- The decisions were made ad hoc.
http://www.learnersdictionary.com/qa/what-does-ad-hoc-mean